"Best practice" for someone is most probably different to someone else.
I cannot (and don't want to) imagine specific naming instructions, is like going back many-many years when we couldn't change the preset names or when we had 4-6 spaces to input a name and we were struggling to understand what preset was it (damn, I almost gave up my age ).
Please don't misunderstand me, I just believe that an approach like that is a little old fashioned.
Well, not for nothing, but you've kind of overshot the mark and put some words in my mouth here. It doesn't need to be as bleak as all of that!
I do agree with you 100% about the necessity of naming conventions being a little old fashion, but that's basically where we're at in the absence of better on-amp sorting and searching options. I tried to wish it away for weeks, but before Maurizio showed up, I was flailing with 1500 profiles named more or less randomly.
Having said that, good naming conventions needn't be anything too involved or cryptic or restrictive, and it doesn't have to be a requirement for every profile either.
Perhaps there would be no consensus regarding a single, ideal set of best practices, but with a little applied common sense and - at worse - a little compromise, a few obvious things do begin to surface. For instance, things really come into focus when browsing hundreds of profiles as soon as you can rely on rig names beginning with the amp manufacturer. For a specific user's library and application there may be better naming schemes, e.g. songs in your band's set list, a studio's clients' projects, etc, but for general users sharing profiles of amps, the amp manufacturer is a no-brainer. There isn't sufficient commonality in terms of model name or year for that to be a helpful browsing scheme (in absence of mfr). Grouping all of your Bassmans just doesn't make as much sense as grouping all of your Fenders for example.
So it's nothing as crazy as not being able to change preset names, or limited characters (except to the extent that profile names are limited in length already); it's mainly just a matter of starting a profile with a mfr's name, and thereafter including (at minimum) a model name and (as length permits) whatever other items best define the profile, e.g. channel/ voicing, year, etc.
I have to ask, have you actually tried Maurizio's backup for yourself? It takes 10 minutes to backup, restore his file, and check it out for yourself. If nothing else, it would keep this discussion on track.
Beyond that, sure, different strokes. I know the reality is that there are already 2000+ profiles in circulation, and it will probably be up to each of us to get them named/ tagged to our own individual satisfaction. But are you really happy with the way profiles are named now? Just one example you gave: some members using their initials before rig names... that's fine on your own amp, but it makes no sense whatsoever for a rig name you intend to share; that's what the author tag is for. In other words, there are a hundred ways I might want to name my own content, but there are sensible ways to name content I intend to share.