@ AAQ
“As gemora says in Kiddushin ~ 29 � a father not teaching his son a profession is teaching him robbery (listut).”
Do you think that all the Rebbeim who advocate Kollel somehow missed this Chazal? Also, why are you cherry picking? The Tana Kama over there holds that teaching iska is sufficient. R’ Nehorai at the end of the tractate says he sets aside every trade and doesn’t teach his son anything except for Torah. R’ Moshe holds that Today that we have Kollelim, learning in Kollel is a profession.