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It can be complicated. I don’t remember the whole story, but I think on the older Xperias you’d have to take care to reinstall the proprietary drivers and there were keys that could be permanently lost and then you’d be out of some of the enhancements.

I managed to install gcam on my LOS phone, and quality was way better

Yes, best chance is to get BSG's version from https://www.celsoazevedo.com/files/android/google-camera/ and install manually.

Is that a Lineage problem or a Samsung problem?

Might be Samsung's lack of openness, but in the end it's my problem.