Exactly opposite in my experience. Seniors (10+ years experience) knows what programming language or library or paradigm or monolith or microservice you use isn't THAT important they all have their problems and everything is a tradeoff.

Juniors rewrite code to use their favorite language, rewrite to microservices, etc.

But it could be we just have different definitons of "senior". The ones with a couple years experience, enough knowledge to be dangerous but not yet lots of experience and not seen enough bad stuff yet are the worst...