Yeah the point of frequency of exposure outside of srs is a good one. Allows you to get extra “reviews” outside of the srs framework, and that wouldn’t be available if it’s obscure and you don’t see it in the wild.
I imagine most of the people who come to bunpro started learning Japanese for some time before, and have learned N5 and maybe even N4, which might be another reason why it has better retention rates than the others.
Your approach to adding new points is interesting but completely the opposite of mine, as I have been pretty aggressive about adding new points at a consistent schedule.
I personally feel like its most efficient to study new grammar / words before I encounter it in the wild. It’s not that I think I would actually know that point just by studying it (even if I mastered it according to SRS) since you need the context to learn the nuance and internalize it, but by studying I preload all of the difficult parts of learning the point, so that I have a good baseline to learn the nuance.
So like while I agree that reading is more important, I don’t see a reason not to consistently add points as long as it’s a manageable rate.
The only reason why I use srs more than reading is really just I can do it without thinking about how I want to study, which is important because of my other priorities. I can just dedicate some time every day to finishing my reviews and then move on. That and I’ve been struggling to find content in Japanese that I really want to consume recently, as I’m no longer as interested in anime/manga/light novels as I once was.