I don't get why the dungeons of breath of the wild get so much hate, I didn't think they were that bad. Vah Ruta is even among my favorites in the entire zelda franchise. I also didn't think the shrines were that boring (excluding tests of strength). For me this game was well worth the wait.
I find it very odd that there isn't something like a door to the sanctum, since a lot of people (including me) went into the fight accidentally while collecting stuff from Hyrule castle for sidequests,.