People tend to not realize how often something is going to be happening with a one in twenty chance and that you are going to be rolling your basic attack roll a gazillion times per session. When you start rolling the dice, making attacks every turn, that is going to come up very often. In fact, statistically this rule would mean that your character would be carrying on average ~13½ arrows. By the time you've rolled 14 times it's more likely that there was at least one 1 in there than not. With multiple attacks per turn that's going to happen infuriatingly often.

It work best obviously with icrpg "balance", those 2 arrows in the game could bring a boss to half health easy.

One thing I quite dislike on standard 5e is most of the time your roll matters very little. And 5e compensate this with rolling more often