15 before racial bonuses though, that’s crucial. For better or worse, 5e assumes a racial bonus in the prime requisite. It’s also worth noting, through the entirety of the open playtest, races granted +1/+1 instead of +2/+1, and classes gave +1 to their prime requisite, or in some cases a choice between one of two abilities (such as fighter getting to choose between +1 strength or +1 dex and monk getting to choose between +1 dex or +1 wis). In that iteration, any character could start with a 16 in the prime requisite for their class, regardless of race. If this was still how it worked, I think a lot fewer people would take issue with fixed racial ASIs.