I don't dispute that the R3 meets your needs and that one can do exceptional work with this body (as you obviously do). It is just that you were pooh-poohing those who want a higher MP count. Even though I don't do bird photography, I would very much want a 100+ MP mirrorless body for landscape and other work (for eg, downsampling a very high MP image may have the effect of reducing apparent noise).
PS: Not a "pro" (and I thank God every day for that)
Didn't mean to poo poo high MPX.. just point out that most folks 'think' they need it, but actually dont.
There really are only two arguments for high MPX that make sense.
1. You need to print that size (and lets be honest, a fraction of a fraction of photographers with these cameras actually do)
2. You like to crop heavily - and this is a very valid argument. I prefer to use big, fast telephotos, but I understand not everyone has that luxury.
Downsampling a high MPX file can reduce noise, however, its not a free lunch.
Another caveat - Diffraction will frequently annihilate your resolution advantage.
All of that said, there is a place for high MPX cameras. It just isn't in the R3. Thats a tool for people like me who want and need high speed, ultra sensitive high ISO clean files.
If I was shooting something other than wildlife, and my friends were shooting something other than F1 for a living we would be looking at very different tools.
All Im saying ultimately, is its important to recognise that the R3 was built for a very specific purpose. That purpose is to serve the needs to people like me. The Sony A1 was built for a different purpose and it suits those that want those features perfectly well.