Not really.
Many advantages to either/or lens type(s).
200-600 sounds fantastic, especially with a faster overall aperture range, but!! ..
This comes with other limitations.
Namely, weight and size.
longer and faster = bigger and heavier.
Their intended market will be more important to them, than numbers and specs.
This lens is a mirrorless design.
The most basic implication of just that term alone .. 'mirrorless' .. means small and lighter weight.
Back in the day when DSLR was the only 'go to' system .. size and weight hardly ever factored into the equation.
Nowadays tho, there is a massive tidal swing towards smaller and lighter, ie. why we're seeing all these f/6.3 and f/7.1 and f/11 lenses from manufacturers that never really used too for the 'general market'.
The general market no doesn't really care tho about very small aperture lenses .. they (appear) to care only for smaller and lighter.
To make any lens smaller and lighter, reality dictates that something has to give, and that's usually aperture size.
While the lenses mentioned seem to compete in some ways, Canon clearly have deliberately differentiated their product using the major advantage that most people seem to be wanting from mirrorless .. that is size and weight.
Imagine the differences between a few different buyer types.
1/. an ex DSLR(maybe 1Dx type buyer that is used to big heavy gear. This person will not care for size and weight issues. Probably got a mirrorless kit to complement the DSLR kit. Size, weight, price probably less important to them than pure performance and specifications from the product.
2/. an avid amateur probably has a few cameras, most likely DSLRs, this buyer may be getting on in age now(as most of us are,
and a small note ** below on this topic), almost certainly looking to update to mirrorless for the size/weight advantage the system has to offer.
Now consider these people and their likely hood to buy into two similar, competing but starkly different approaches to their respective two products!
Sony has a 60+Mp camera and this 2.1kg 200-600mm lens and combined require an opening in their bag that needs to be about 400mm long, by about 120mm wide(to fit camera and lens mounted to each other)
Canon has a 'similar' but different product range, 45Mp camera, and a 1.5kg 100-500mm lens.
Both #1 and #2 prospective buyers both have enough experience to know:
*difference between 500mm and 60mm whilst it exists, is minimal to the overall ability to capture most subjects
*huge difference required by the two competing products in terms of size and weight. Space availability and ability to lug gear around is very important to #2, less so to #1(but still on #1's mind).
The difference is that you could almost include a secondary body in the bag in terms of space/size equality if you go with the Canon system.
*IQ. Both will have very high IQ, maybe the size weight penalty is justified in the Sony system. Buyer #1 is more likely to want the Sony system due to the faster aperture, ie. more likely higher IQ potential due to aperture(rather than focal length).
If you had to steer the respective companies to a profitable position based on those very basic marketing philosophies .. which design would you go with.
No doubt that Canon could have easily done a competing 200-600 lens as Sony did. Would it sell in the same numbers to make it more profitable. If not, then add price mark up to make allowance for this lower volume product.
How many photographers clinging onto the
heavier/best IQ/best specifications sheet philosophy survive in this post DSLR era?
How many photographers switching their philosophies to the more modern
size and weight cut/good enough IQ is near enough
I dare say that Canon's marketing depoartment researched this to the nth degree and found the second statement to have produced larger numbers .. hence Canon made XXX-XXXmm lenses to suit.
** Age and the remaining few of us camera/photographer types out here now.
As can be seen in the sales numbers(COVID notwithstanding) .. many newer generation 'photographers' simply don't care for large cumbersome cluttery gear.
The camera industry in a couple of generations may simply cease to exist in the way we know it now. Just as a couple of generations ago(from our viewpoint) the camera industry has changed no end.
I was out and about very little in the last year or so, rarely took camera gear(had other interests to keep me occupied), but I did notice many younger folks(and my companion) taking photos of anything of interest with their phones.
What amazed me most on one occasion was trying to get a snap of a couple of Rosella like birds a bit too far away maybe for a 200mm lens! .. all with their useless phones. Looked at my copmpanions image and it showed a backlit tree with what looked like a small dust spot on one branch
Camera gear is too cumbersome, and most don't like the idea of lumbering around with it all in their pockets!
Very little is new in the photography arena, contrary to what many people seem to believe. Yeah, technology is making things smaller/faster/better/etc .. but the overall concepts are based on simple principles.
One of those defining principles is that most people don't want to be lumbered with bigger/heavier equipment.
.. hence,
probably, Canon's reasoning for this 'odd' lens specifications.
Do I think they should have done whatever with whatever product .. makes no difference to me.
If they think this will produce a nett profit for them ..