Earlier quoted context omitted.
I still think its fair to say we use the equal temperment system. It is a widely accepted standard. You're right, fret pressure alone can absolutely raise the pitch 5/10 cents, my Gibson SG has some deep frets and can do double that. I am surprised with all of the technology and VSTs we have now no one really uses self adjusting Just intonation or challenges A 440. Musical / mathematical / technical ability are a rar…
Microtonal music really isn't hard to find. It's just not very popular, because it's too niche for mainstream listeners. And most popular VSTs - Serum, Pigments, Massive, Phaseplant - all use wavetables and not 'the same old square and saw waves.' Modern pop really isn't any more generic than 30s/40s jazz, 50s rock and roll and bubblegum, and so on. That's why it's called popular music and not experimental music.
There's also a "trailblazer" effect which is kind of weird because it doesn't happen in classical music. Namely that we listen a lot more to Miles Davis and Coltrane than the random swing band of their age. Heck, Miles gets more props than the sublime big band swing of Duke Ellington.