Yep, 8fps is adequate for most things
I mentioned it before, but my opinion is that any new tech should be at least on par with the current market. These cameras aren't unfortunately.
Well, the A9 can only go quicker with electronic shutter, which at present has its own issues. The A9 has an equally abysmal 5.5fps with mechanical shutter which is poor when you consider its cheaper siblings have 8-10fps.
IBIS isn't lens dependant.
But still now word of weather sealing on the Z6/7 or lenses yet either.