Just thinking that perhaps in some cases it would be how far into the stall you fly
One needs to be cognizant of the relevant requirements and what might have been done during the Type Certification program. Keep in mind that TC requirements vary over the years so a flick through the historical FARs and AC 23-8 revisions can be illuminating.
For instance, I recall a tale from a flight test short course, years ago, where the FT instructor related a tale from a USAF FT training program: the USAF student wanted to see what would happen should the particular aircraft (a well-known civil cabin class twin) be held into the stall. Now, the particular model, at TC, was only tested to stall onset as we were briefed at the time. The (very experienced) FT instructor, having seen it all before, let the student do the deed - result was the usual buffet, etc., followed by a rapid flick into an inverted spin.
Take away message: sometimes a bit of research is useful and, on occasion, this requires some discussion with the OEM FT folk to find out just what might have been done.
We really need to be a bit conservative out there in operating land .... especially should we not have all the details of the story ... PA, I suspect, is better informed than many. However, the many may, on occasion, allow their lesser knowledge overwhelm their caution.