IMO the period through which SS is appropriate is shorter than the period over which it's effective. It's altogether too common for people to come to the conclusion that weight on the bar is the only progression that matters. Something like a double progression is almost as simple and at least introduces the idea that there are other dimensions that are worth progressing in. The other thing is that because novices can improve session to session, they can go a long time where they're legitimately close to their 5 rep max but don't have the practice to maintain good technique especially through the later sets, and end up ingraining bad practice.
That eventuality of needing a more nuanced program comes before most novices realize it, and definitely before SS starts running out of steam.