Dont get me wrong - I really like and appreciate your comment.

However, and adding to other replies, by SDL I assume you mean the Simple Directmedia Layer?

SDL looks rather strong from my perspective and still my typical goto when having fun making a game. You could argue SDL lost some customers in favour of other libraries like RayLib - or moving away from making things from scratch to Unreal, Unity, etc.

SDL still seems popular - as SDL version 3 was officially released less than a year ago (or it feels like it) However, I guess it depends what you need to do.