Lol not the same move exactly, but you are forced to rewrite your post to account for the interrupt or take the hit. So usually you change your strategy and leave less room for 'openings' while the other opponent keeps trying to do the opposite. Most people not accustom to fighting without interrupts have the exact same comments and interests as you(not that this is a bad thing). But I have played on both sides of the fence, and not using interrupts does not equate to 'sitting there doing nothing whilst my enemy does junk.' because most people seem to have that outlook on it every time I say it(as well as the old 'yew dun liek interrupts because yew dun know how to use them' thing). 

It just means actions are either simultaneous or happen in a forward-flowing motion. (Ex: Ian shoots his gun at whatshisface. Whatshisface watches his hand move, and isn't an idiot, so knows he's getting his gun. He places his shield in front of him to absorb the incoming shots, and then cover fires at the same time using blah blah).

Sorry if this comes off as snarky or something. It isn't, I assure you.

EDIT: To clarify on how my system doesn't just overlook screwups, I'll go back to the above example. So whatshisface, instead of preventing ians actions from occurring, has instead dealt with that action while delivering his own action. But now lets say the bullets Ian use explode on impact like a grenade or something, and whatshisface forgot to account for this in his defense. At that point, Ian could argue that whatshisface is dead, needs to repost, or takes damage assignment. There are an infinite, probably better number of examples out there, but I hope this clears it up at least somewhat.