Stalker, Solaris, Pisma myortvogo cheloveka, Posetitel muzeya, Gadkie lebedi, 2046, Golem. Still think that sci-fi needs action?
Yes
They're not bad movies for sure but sci-fi really needs at least a hit of action at some point, otherwise it becomes just too much like a wannabe mockumentary... kind of philosphical fakery of where mankind might go one day.
Take Solaris as you mentioned... they could have set it on Earth, with no sci-fi stuff and set it in modern day.
It didn't need the sci-fi setting, simply because it's just another quiet mystery movie with a hint of dodgy romance.
Golem is similar.
I wouldn't class
2046 as sci-fi though... it has some small hits of sciencey stuff, but not enough to class it in the sci-fi genre.
There are one or two sci-fi movies that work brilliantly without lashings of action scenes, but not many.
Most of them were written years ago by the Masters of Sci-Fi and were actually written to be the way they are. Asimov's
The Bicentennial Man that was made into a movie in 1999, Arthur C Clarke's
The Sentinel turned into the movie
2001: A Space Odyssey in 1968... they're both decent films due to the way they were written and the elements involved in the story...
... the rest of them are simply mystery or romance or both that could have been made without the sci-fi setting.
The sci-fi genre goes hand in hand with action and exciting cinematic scenes, without including some loud proud fun they may as well have just set it in this time without any sciencey stuff.