Dear Always,
Your opining that the Rambam finds fault with him valuing his learning over the learning of others. Then it would follow if no-one else is learning or involved in mitzvos than it would be commended. That does not appear to be correct. The Rambam should lead with taking charity when one is able to feed himself. And it should be in hilchos matnas aniyim. The Rambam clearly leads with one who plans to immerse himself in the study of Torah. This is perplexing. It seems like he got the whole approach wrong from the beginning. Not the result of him learning of someone else’s back.