If you are using or thinking about using mirrorless, what is your main motivation?
I am aware that you are attracted to many advantages of mirrorless, but what motivated you the most?
Came to 4/3 then M4/3 mainly because of the self-cleaning sensor which works.
Stayed because it is small and light and delivers the results I want. The excellent IBIS means that I have abandoned taking tripods with me any more on holidays.
So for me a few different reasons but I ticked the small and light reason as I am sticking with the smaller M4/3 bodies and mostly smaller lenses available.
Never rolled on from Nikon SLR film gear as I was dismayed by the bulk and awkwardness for me of the those early DSLRs, the 4/3 Olympus E-300 DSLR solved that bulk reason, and then the Olympus M4/3 Pen bodies made things smaller again. Happy to carry all day a small shoulder bag that weighs no more than 3kg and have usually 4 or 5 lenses from 15mm to 600mm equivalent in it.