Also, it probably shouldn’t apply to monk fists, as that is a martial art, not tavern brawling.
Actually, for DnD, there's the logic that Str based combat is more brutish and unrefined.
For example, there's the "Thug" style of subclass for Rogues that is Str based and enables them to sneak attack with non-Finesse weapons (Replacing speed and precision with brute force)
Meaning, thematically a Str based Monk would be less martial artist and more tavern brawler.
Of course, the feat is incredibly powerful as it stands. Giving so much hit and damage, it's absolutely bonkers the damage output that can be done using it.