Not sure it's a millenial thing, but yes

And to be honest choice fatigue also plays a part.

(Also millenials seem to sell some places as "gritty and authentic" when in reality a lot of them just suck)

I'm all for trying new things, but in the end you realize that a lot of those are just not for you and you go for the bland and tested thing

For me (considerably older than millenials) it's not choice fatigue or "default to bland and tested", it's "if I'm paying a small fortune for coffee / food[0], I do not want a crappy serving just because the barista/cook stubbed their toe / broke up / got bad news / etc. this morning and they're wildly off their game."

Starbucks, McDonalds, Papa Johns, etc. do not make "great" refreshments but they make them of a consistently sufficient level of quality that you can be sure you're not wasting your small fortune when you buy from them wherever you are.

[0] As, sadly, we are all forced to these days.