AJ4's are too expensive to skate in, and no one but pros and IG influencers will actually do it. It would probably be the most cushioned and supportive cupsole out today by a mile, though. I know skate shoe designs are generally moving in that direction already, but hopefully this furthers the trend of brands putting out shoes with full length midsoles, proper cushioning/support, etc.
I've never had 4's before, but I've had 3's, and I think they'd skate great if you took the time to break them in first.