I fully understand what you are intending to do. I’m trying to convince you to consider doing something far more useful instead.
It is obvious that statement is not true. We can see you have chosen to continue to allow filletSrf to fail instead of calling this function and producing the surface when the user asks for it.
You know filletEdge has this same bug. If the user selects edges that contain a same size fillet the filleting will fail. There is really no excuse for not fixing the bugs.
Don’t you think the users are getting weary of the pooh-poohing of suggestions to fix the bugs and instead being given tiresome workarounds?