This is an interesting question. Sort of chicken vs egg. I’ve heard both this, but also the opposite, where, at least from a bodybuilding standpoint, increases in strength can be seen as an indicator that you’re progressing in building muscle. So, the idea isn’t that you should focus on getting stronger, thinking it will then make you build muscle, but focus on building muscle and use strength as a check in.
What needs to be kept in mind, though, is the neurological and technique improvements that also lead to strength gain. So, it’s a better gauge for simple movements or ones where you already have a lot of experience and aren’t changing technique.
Sorry, this isn’t an answer to your question. I’m just jumping in, hoping to add some other angles for discussion.