The main thought / idea behind using the stop n go play is simply that you don't want to fold your hand preflop but you don't have any fold
equity... since you have a hand like say, JTss or QTss, something like that, and you know your opponent is opening a wide range of
hands in late position but if you reshove over his raise he is still priced in to call you, its possible you are better off just calling preflop and shoving all in on any flop as its likely to not have hit him and also its likely he was just stealing with a marginal hand...
Good example
Late position player raises with 33 and you are in the big blind with 8 or 9 big blinds... Late position player made it 2.5x... You look down at JTss... if you reshove he is pretty much pot committed to call you with any two cards... If this is the scenario you are just coinflipping for your tournament life... Why not if you know he HAS to call because he's priced in, why not call and see a flop like A Q 7 and just shove into him and make him fold and pick up what's in the middle... sure he will call sometimes, but it's better to do this selectively against an opponent who is either passive postflop or against a player that opens very loosely in late positon