Nadaka said:
More strength means that you can apply more acceleration to an attack, resulting in a faster strike that is harder to avoid and react to.
While it's true that IRL Speed Strength is defined as work divided by time, where work is defined as force x distance, this has no bearing on
accuracy, which is the sole determining factor in whether or not a strike actually
connects with a target. You can be crazy strong all day long and lack the coordination to hit
anything.
The truth of this can be demonstrated by the fact that not everybody hits their intended target every time that they fire a pistol or rifle -- and the momentum of a bullet is thousands of times that produced by exerting physical strength on an object. Sure, it's really hard to dodge a bullet -- but you don't need to if the shooter lacks the coordination necessary to accurately sight the firearm.
More importantly, however, STR does not have anything to do with speed in the D&D RAW -- this is the sole domain of DEX. So, while STR may have some bearing on the speed with which a blow is dealt in real life, it has absolutely no bearing on that same element in D&D because D&D doesn't mirror real world physics mechanically.
[Edit: I should clarify -- the argument "It makes sense for STR to affect a to-hit roll in D&D because 'hit' means something different in D&D than it does IRL" is a good and valid argument (but, even then, only applicable to D&D as the word "hit" means something different there than it does in True 20). This wasn't the argument that was made, however. The argument made was that being strong IRL bestows coordination -- the reality is that these two things have ZERO bearing on one another IRL.]