This is now mostly* off-topic from the thread's topic, but Dex does reign supreme in 5e, with Str and Int being The Dump Stats™ shortly followed by Charisma. I'd be in favor of returning to earlier editions'/Pathfinder's rules, where
-Str bonus is added to all melee damage rolls unless you take a feat to apply Dex to damage (with finesse weapons only).
-Ranged weapons apply no bonus to damage without a feat and composite bows are brought back into existence (add Str bonus to damage)
-Int bonus gains you additional proficiencies. To prevent an overabundance of proficiencies, maybe not at a 1:1 ratio. Something like: 12 Int gets +1 proficiency, 18 Int gets +2 proficiencies (and 8 Int gets -1 proficiency?).
*Such changes would make the races with Dex bonuses less OP, effectively making all other races-including tieflings-better.