Your comparisons are wrong, yes it's true that if your
body isn't fast enough... No matter how fast
you're reaction speed is or
how much you see/know the future, you'll get tagged at some point... Especially close range when they can
fully blitz your
movement speed
Whenever there's 2 users who both can use amped reaction speed and precog, it gets quite tricky as they can negate some aspects of your ability by either looking at the future more or spamming it faster/better than the other
So even if luffy saw kaido was going to move and attack, kaido could also already see luffy dodging that in the future, giving luffy barely any time to do anything as kaido's already moved and is able to blitz his movement speed
precog users are easily able to dodge infinite speed... As they can time it and dodge before it even happens by knowing where and when it will happen, so yes future sight especially with some who is skilled in fighting has a huge advantage... tho at some point there will/can be an instance where you're cornered and while you're seeing the future... The person has already moved meaning if that person can blitz your movement speed you will get tagged as you saw the future too late
Now it's about deku vs shanks... A shanks that can see the future and has amped reaction speed can easily time a divine departure even if deku is faster or much faster
I've now went too in depth for something that doesn't even matter as shanks still has his aoe con haki