But what you're describing is VAR done badly. And of course I'm not in favour of bad VAR - and I would definitely count the current implementation as "bad VAR". But I don't think that's a justification for writing off the entire concept of VAR, or simply slumping back and accepting that key moments in games can be decided by referee mistakes and that's how it will always be.
I think that refereeing can be made better through technology, and that if done well, that will absolutely be a good thing for the sport. One failed experiment doesn't automatically mean that all future attempts will fail and we're wasting our time trying.