Maxperson
Morkus from Orkus
The thing most people don't get is that they also get very little from increasing primary stats. The +1 or +2 is virtually unnoticeable. You aren't going to notice the 1 extra hit every 2.5-5 fights. The extra point or two of damage doesn't do much in any given fight and spreading out a ton of not doing much over 1000 fights just equals a whole lot of not doing much.That's level 1. D&D is a leveling a campaign game. A big aspect of D&D is the stuff you are good at go up in level.
Starting with a 14 Charisma is one thing. Continuing to boost it with your ASIs is another. The fighter class gets little from increasing INT, WIS, or CHA so their scores fall behind. A wizard gets little from increasing their STR so it falls behind.
There's little reason for a fighter with a 16 strength to increase it over say intelligence or wisdom, which is why getting a feat is almost always going to be better. You'll get more out of it and what you get will be noticeable. That also means that there's little difference between the wizard with +1 and the cleric with +3.