I absolutely agree with you on the fact music is now drenched in post-production, and live performances are locked to a click... Alot of modern AOR and Hard Rock is run through the same plugins and all aim for the same sound.
However, there are still bands out there absolutely doing what you've described, but hard rock and metal isn't mainstream anymore, so these bands don't get radio play. It involves a bit more digging, but you will seriously find some real great modern writing and production. The 70s rock revival a while back brough out amazing bands like Vintage Caravan etc with that old sound.
Seeing these new bands with flares and big Marshall stacks is really cool. (Not including Greta Van Fleet lol)