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May I ask why two cables per room?

There is room in the conduit, and pulling two is just as easy as pulling one. So it just makes sense to pull two I think — for future-proofing.

Ah, ok, it is just an over-provision "just in case", I thought there was some peculiar intended setup that required two cables.

Yes :) They could be bonded for redundancy or increased bandwidth, or used for different VLANs.