“I have yet to hear any rav of stature suggest otherwise.”
The Yeshiva you refered to above decided that the bizyonos of real welfare was too much.
The bizyonos of actual begging either door to door or in shul are even greater.
The reason why Arayos (immorality) are so stringent is because of the associated human degradation. The term used in the Gemara regarding such matters is “Kalon” (degradation).