Time for Sony to roll out some big long glass!
Adapting is problematic.
1. Precision of the adapter ring compromises IQ.
2. Adapting of UWA is tricky. I have friends adapting the Laowa 12mm and the IQ in the edges are atrocious. It is however just fine natively mounted on DSLRs
3. AF. Good luck. Not going to trust an adapter's AF ability when I track birds and what not.
Adapting has lots of advantages too, obviously.
Sony also released a 100-400mm, but such a "sunshine" lens isn't enough! More more more! 400/2.8 500 and 600/4, 800 f/5.6!