Oh yeah, I had the same experience with Arkham Knight (i think). Control on the other hand doesn’t have a secret ending and I wanted to get every collectible there is, because it’s more lore that I love. I think if it had a secret ending I’d get it by accident lol

edit: when I said grindy I meant more like warframe grindy, it’s not that the gameplay is bad, but it just feels timegated even when there is no timer attached (resources hidden on specific planets, bosses, etc)