It's not really a small percentage of users. All users will have trouble with the battery - eventually. My DS4s ran out of battery life in about three years of usage; I still have one of them that I use wired with my PC, but I absolutely cannot use it wireless. Likewise with my DS5s - one of them barely held a charge 2-3 years in. I'm sure with good battery management you can extend the lifespan to be closer to 5-6 years, like my M1 MBP from 2021 that still has a 9+h battery life (though down from 12 as I remember), but that only keeps them going for a little longer. It's just a fact of how Li-ion batteries work that they will lose their capacity eventually.

E: DS4 = DualShock 4, DS5 = DualSense; these are the standard PlayStation controllers for the PS4 and the PS5 respectively.