This seems like a Jewish version of internet flames between working mothers and homemakers (Now, settled by Corona to a draw as WFH…).
Looking at bigger picture, it seems that most people are supposed to work – make your shabbos like hol but not get tzedoka; many tried to be like Shimon Bar Yochai and failed; teach your son Torah, profession so that he does not become a thief; Rambam quoted above. Although Rambam himself seems to prefer learning, including science from Muslims, until the death of his brother.
So, obviously, B- full time learning at someone else expense is an innovation, cause by destruction of Jewish communities at modern times. Simply speaking, at times when anti-semitism protected the community, one could be an ignoramus or an apikoires, and still have Jewish kids. So, emergency measures were used and probably were the right ones.
In one reported conversation right after WW2, Hazon Ish quotes to the visiting Satmar Rov the Rambam that his yeshiva system is the desert where you are supposed to go when there is no other place to live. [ad kan Hazon Ish]. Obviously, we are closing on 80 years ” in the desert” – twice more than Moshe Rabeinu – and we now experience negative effects. To such degree, that people have to apologize for working.
At some point, this self-preservation is becoming self-defeating – we are not preserving live Judaism, but some unauthentic dead copy.