cosmiccomet
The Airbus has recommended certain procedures to fly their aircraft. You need very good reason not to follow them. What Boeing says is Boeing's problem. A line pilot no matter how brilliant he is has exposure to only his environment and flight manuals provided to him, which are not enough to develop procedures. Airbus has access to the software, the hardware, wind tunnels, proto type test pilots and they receive incidents from all over the world. If operators face specific problems in specific situation the safe method is to refer to the manufaturer with possible solutions. Enhance your skils keeping the situation at hand in mind. I do not think in FBW aircraft, line pilots should change or device their own procedures because things are not as simple as they appear. I mentioned a fatal crash where if both FDs were switched off instead of only one 92 people would not have died. It is very easy to use a calculator not so easy to understand how it works. Now about your question, GS mini is a constant GS approach concept, if you use selected speed even with ATHR you are not flying with that concept, that's all. Boeing uses higher airspeed approach concept. You can keep building arguements for and against. Finally it is what you are comfortable with will matter.