Originally Posted by Llengrath
Here's the thing: per base rules you can only achieve a 16 (+3 bonus) if you receive at least a +1 from race and starting with a 15 is terrible. The entirety of DnD5e is balanced around the assumption that you will start with a +3 bonus to your main thing. All companion characters reflect this too, having a 16 or 17 in their primary ability. Therefore, starting with a 16 Wisdom as a half-orc cleric puts you right on curve, whereas if you start with a 15 you will forever be behind Shadowheart.
A better way to solve this "issue" is by letting you roll for stats (or just outright choose your attributes) where you are most likely to roll atleast one 16 which can be placed at your discretion.