[Champion Steve]

I'd say that 'praying' for a critical hit (or even a secondary effect) can be a valid strategy. If you know that the bulky sweeper requires quite a few boosts to pull off a sweep, the odds of it happening become not insignificant. Of course, no-one likes it when their otherwise solid switch-in gets immediately critted. Part of me wishes that crit chances started at 0 when something switches in or gets critted and then rose to some cap as it got hit.

I can't imagine that the metagame suggested would be that hard to implement. However, I feel that the predetermined RNG idea is infinitely superior. It opens up *so* many strategic possibilities and would never feel unfair. Low accuracy moves would retain their advantages while having a super neat skill dependency.
'The current RNG distribution is unfavourable to me... Do I switch and steal the good RNG?'
'Those are some bad RNGs coming up. If my Choiced Terrakion uses Stone Edge, it'll need to switch after this turn. But if I use Close Combat, that Volcarona will setup all over me...'
'Those are some pretty favourable RNGs... Time to bring out my Jirachi for some completely hax-free flinching fun!'

...we might even see moves like Zap Cannon...