There is the saying that to get 5 years of experience in 1 year you should work in a startup.

This isn't only about title inflation. It is in some ways true in the real sense also. Because in a small team you get exposed to everything and if things don't work, it's very obvious why and there are no excuses to hide behind. Whereas in an enterprise you could sleep behind the wheel, roam around in pointless meetings, wait for the other department blocking you, ride on your teammates merits, close 1 story per month and nobody would question.

This isn't to say there aren't great minds in big organizations, I've been in both contexts and learned tons and met absolutely fantastic colleagues and experiences in both.