I don't see why people are so quick to want to kill off ability scores for just modifiers. Pathfinder 2e revised did that and all of a sudden realized improving scores became harder to track (because a +1 to strength might move you from 14 to 15, but if you only have the mods, it moves you from +2 to +3, equivalent of a two point jump). And they had to kludge together a system to keep Backwards Compatibly

.
Scores are like alignment or saving throws: yeah there are probably better ways to do it but getting rid of them entirely removes a key elements of D&D's identity.