One of the things I was most disappointed about in 5.24 was the move back to Ability score bonus per day class features. Imho, class needs to be decoupled from ability scores so as to not encourage "race to 20" in your primary score.
I think Basic did this best; outside of xp bonus for higher score (13-15 +5%, 16+ +10%) no class got a boost based on their primary score. Fighters got a +1 to +3 to hit and damage, but so did everyone else. Wizards and clerics spells were not affected by Int/Wis (not number known, spell level, slots or saving throws) and thieves got no bonus to skills for high Dex. The net effect was that it actually wasn't bad to have A 13 Int wizard or a even 12 Dex Thief. All you were out was slightly faster XP gain.
Ideally, I'd like to see D&D return to something like that where the gap between a 13 Intelligence wizard and an 18 Intelligence wizard is miniscule. Anything that helps break the "must have a 20 ASAP" is good in my book