It's not "lol" or "tradition," it's how theatre seasons work in London and New York...
If you want to make up your own Gizmo Awards, go for it. But in the real world, when a new, full-fledged production opens in the West End or on Broadway, that's "new" by definition. Same thing happened here when Groundhog Day opened in 2017 a year after it did in London. And Matilda. And the current revival of Angels in America.
I've heard raves for Jamie as well, but Hamilton was just as equal a player in this Olivier season, and it won. Sorry you're mad about it.