It's unquantifiable, yes, possibly even placebo at times, but I think of it as paying for the features on top of search. I particularly find being able to create and adopt a search "lens" / focus and the ability to (de)prioritise domains very useful for my situation and needs.
That being said, I totally agree with your sentiment. I also only have limited subscriptions I can practically maintain, and I feel like this one's earned it's place well enough. To each their own I guess.
I'd like to think Firaxis and Sid Meier still hold water for Civilization at least, but I do get your point. Most of the games I go back to now and enjoy are nowhere near the ballpark of "AAA".