Amen to everything you said, there is no tech or way to do things that are better than others. There may be some known formulas and habits, but the perfect rig is the one you're most comfortable with. Period.
There's one thing, though :
I'm trying to justify me owning a Helix, and my friends and all those high profile musicians like Metallica owning and using modellers from Fractal and Kemper lol Because the internet as always knows better than Metallica, Vai, Petrucci, Satriani, Schon, The Edge and all the other professional guitarists that have hundreds of gigs around the world.
About who uses what, i tend to keep in mind that big names are also business names. Having a thing in your rack doesn't mean you rely on it, you may as well use it for alternate sounds, for tracking demos or overdubs, to reharse in hotel bedrooms... In fact, there are various situations, including never using the gear. Even the most expensive signature models are a thing and the guitar the guy really uses, another one - because the first is a reproduction of the latter, or simply because they are made in different factories by different people. Generally, artists tends to be most welcome in the customs shops, their desires gets most attention from the crews and there is no economic choices like when you sell something to the public.