It's true that a compressor can cover up some types of bad guitar technique. But so can high volume, and uncontrolled acoustic feedback. Covering up bad technique is not the only reason to use a compressor - the instrument we love has a sustain problem, we only put energy into the string at the start of a note, unlike a saxophone or violin. Acoustic guitarists were thoroughly ignored as a breed because they were never loud enough, and nobody could hear them in the band.
At our weekly jams, I often play single-note guitar solos with clean tone and using an acoustic guitar (plugged in). I can play without a compressor, sure, and have done so for years. But I started using one recently, and you know what? If I do use one, people hear me better, and my solos can be technically better, because I'm not forced to play barrages of fast notes just to be heard. With a few dB of compression, I can throw in some longer notes as well, and still be heard.
I also play amateur recording engineer for my own compositions sometimes. Ever wonder why virtually every recording you ever hear has compression on it? Certainly it's not because all those hot-shot studio musicians can't play properly without a compressor. These days, with digital recordings, it's also not because the recording technology is incapable of handling the dynamic range. And let's leave off the made-for-radio crappy pop that's compressed for maximum loudness.
So why is compression used almost universally on recordings, then? One reason is because a mix usually doesn't gel as well if all the instruments in it - particularly the ones providing the basic rhythm and harmony - are fluctuating in volume (for example, guitar and bass notes decay away after the initial attack, so volume isn't constant). Adding just a couple of decibels of compression to bass guitar and rhythm guitar can really improve the sound of a mix. This works live, in a band context, too; not just in a recorded mix.
I agree entirely with what you said earlier: we're not all the same. We don't all have the same tastes. And life is too short to waste it worrying about whether someone uses a compressor or not!