Should old character's gets buff/kit change yearly to keep them relevant?

This about powercreep in gachagame in general.

I feel buffing or changing old character kit should be something game developer do in yearly or when it needs to do it. So old character don't feel irrelevant or make players feel demoralize after seeing a better version or when they character they loved/invested in no longer of use.

For example when I play star rail, I invested a lot on Blade and Dan hang IL, but now I feel stupid for pulling them with upcoming characters doing more damage and having better kit in general.

I also like Limbus and Arknights way of handling the character. In Limbus they can add new Upti (basically upgrade character) to old characters to make them feel better. And Arknights is build in way that every character have used in it.