It seems to me that the zones are effectively time locked, the npc charecters quest don’t react diffrently afterwards so for me dolmens are just like any foe, it’s the vestiges memory of events rather than new ones.

None of the voice lines are subtracted, but several are added that specifically refer to the main quest NPCs.

Varen's gambit nearly handed the empire to Mannimarco and Nirn to me.
Mannimarco was a pawn. You are another. Come. Let's play.
Where has the giantess gone? Back to milk some mammoths?
You and Sai Sahan have much in common except you're not a complete failure.
Where has little Abnur Tharn run off to? Where does he hide?
The King of Worms served me poorly. Perhaps you will do better.
The Prophet is a fool, and you are a greater one for following him.
The Battlemage has the amulet, but you have true power. Fight for me.
Mannimarco's failures are your opportunities. You both shall serve me well.
Where is that failed Sword-Saint now? Brooding in some sandy cave on the edges of Oblivion?
The Tharns and their trinkets. It is weakness to rely on toys for strength.
Lyris Titanborn. She was the best slave at the Black Forge. Whatever happened to her?


https://forums.elderscrollsonline.com/en/discussion/364527/every-dolmen-quote-probably