Interesting to hear other perspectives. I suppose as flights get more restricted that makes sense. However it strikes me that if one is talking about a 200-400 or 500/4 the size of the lenses is still going to be an issue.yes and no
Birders who have rigs setup wont complain about the 1dx and big whites
But most birders don’t like weight
They have to fly to their destination with it and sometimes you don’t have porters and hence have to carry your gear long distances
size is also a negative
I do a lot of scuba photography and that entire field is going mirrorless because the housing for a 1dx is massive because the camera is already large
I think the best word is balance with nature photography. Sony is a bit too small but the 1dx is a bit too large. The 7d was very popular for many reasons
It certainly makes sense for scuba diving.
I used to use a 7D with various telephoto lenses but couldn't get on with it, perhaps I am just stuck in my ways but I like the size of the 1D bodies, or more particularly the form factor and buttons perhaps, when using the biggest long lenses. The rest of the time I hate it! I suppose if the whole thing could be shrunk maybe 10-20% that would be good. But small light bodies with big big heavy lenses just doesn't feel comfortable to me.
I've seen others using A9s with various adapted Canon whites and I really, really couldn't get on with the ergonomics and balance yet clearly many others, many talented photographers, can. I suppose this sort of thing is the perfect example of there being no right answer for everyone.
The last safari I went on a German photographer there had an A99 II with some of the exotic Sony A-mount long lenses and that did impress me. Despite being a full frame SLR/SLT, it's surprisingly compact, somewhere between a crop and full frame Canon SLR, when gripped it did feel like a sort of mini 1D.
One thing I am confident about is that Canon will pour a huge amount of energy and time into the ergonomics of any future RF mount pro camera. I think there is no chance that it will simply have the same body as the others. In some ways it is cool that Sony did that, eg for sharing grips and batteries. But I expect Canon will produce something like a slimmed down 1DX style body. We will see - probably a long wait yet!