Is ultrahypofractionation appropriate for a B51 candidate receiving breast-only radiation?

"I believe in the data of biologic equivalence, and I just treated patient X with ultrahypofractionation (UHFRT)...but I can't treat patient Y (who looks extremely similar to patient X, with a few idiosyncrasies) with UHFRT...because '"reasons"' ...*scratches chin*

Hard as it may be to believe, ther...