Movies too smooth on 4K LCD (not SOE)

[Flack999]

Hello.
Recently I made the jump from Full HD to 4K and it has been disappointing.
I bought a TCL (german model, they are a bit different from the US ones, but should be similar to Series 5 over there). 10 Bit Panel, 400nits, 60Hz, good contrast, supports all HDR standards, generally only very positive reviews on European video and hifi websites. Price range 600-700€.

But stuff just doesn't look right and I am trying to find out if this is a general problem with 4K LCDs or just this one model.
My problem is that all my films suddenly look way too smooth and clean. Motion especially has been bothering me on everything I've watched to far.

First, I know what everybody's first instinct is, so: No motion smoothing or True-Motion-like option is activated. All filters and smoothers are turned off, picture setting is cinema, Sharpness is zero, colors setting is warm - pretty much all the settings you're supposed to have for watching movies.
I am mostly watching Film. 23,97fps Blu-Rays or MKVs, some UHDs now too.

I come from a 10 year old lower-price LG LCD and everything always looked fine. Now, it seems everything is running in more frames or smoother frames than it should. Everything looks too clean and more digital.
I don't think it is just the resolution increase, cause some UHDs (like Alien or Blade Runner) can look properly amazing and filmic.
But everything else just has that smoother effect. Again - all picture smoothing options are off, no filtering (at least as far as I am allowed to turn it off in the advanced menus)

I am aware TCL had some issues with software and motion-smooting turning on by itself, but I think that is a separate issue. It's a whole other kind of awful when I turn that option on and I get the Soap Opera Effect. What I am talking about is more subtle.
I guess what I am wondering is, is if the new TVs and current ways to reduce judder and motion blur, generally has this smoothing effect on film?
So far in my home-cinema days I've had two Full-HD LCD and one 1080p Beamer - none of these ever gave me the feeling that film didn't look filmic.

I am sure most people would not even know what I am talking about and would not notice any smoother or faster frames, but it has been grating on me.
I feel like maybe it is just me and my eyes. Have I been watching films too long on a shitty LCD that had bad pulldown and judder and the new, better TVs are too good?
As stores only show their motion-smoothed demo shit, I can't really compare there.
I am considering returning my TCL to go for the SonyXH9005, but I am worried I might have the same effect of everything moving smoother than it does at the cinema or it used to on my 1080p Tv.
My TCL has 60Hz and the Sony would have 100-120, so maybe it seems even worse there?
Maybe that super crisp and smooth image of 4K Tvs is just not for me?
Does the MEMC of my model just does not agree with me and the Sony would feel better?

Maybe somebody has some tipps for me.
The simpe and easy answer is: get a new TV. But as everything else (contrast, colours, brightness, handling) of the TV seems great and my Ps5 Games look amazing, I am hesistant if the problem might not be another one.