the opponent seeing what you are trying to get is something called good game design. it gives counterplay, and puts in mindgames for olimar which would be a fun thing to put in. ok, the second point is kind of true but what if the next pikmin that you pluck replaces the last pikmin if you have 4 pikmin out?
and it works like this. lets say i hit a smash, grab, hit a smash, grab, hit a smash, pluck. i get a purple. the next pikmin i pluck AFTER the third is said pikmin. each pikmin color has a number count on its own, which i dont think is very complicated.
if i know whats comng next, then what if what is next isnt what i want? what if they are playing someone like jiggly puff and i want to knock them off really fast and i have a red next in line, then i have to pluck and throw 3 pikmin because im trying to play the matchup. it just puts him in bad situations for no reason, kinda like how he spawns after losing a stock with 0 pikmin, hes being punished for playing a character.