I keep using FF, APS-C, and m43 systems.
No plans to change that.
IBIS attracted me to m43 initially.
Short register distance did the same to get me to buy Sony cameras.
That way I had other options for my Leica M and R lenses.
Then we all found out how much sensor cover glass thickness really matters...
My most used camera these days is a Sony A7r2.
Hopefully the FE 70-200/2.8 GM OSS with teleconverters performs well enough on my A7r2 for birding purposes.