It is refreshing to see an audiophile prioritizing the room. The best gear does not nearly sound as good as it could and should if the room is not right.
Surely some rooms are not right and need fixing. But IMHO we should buy the equipment that fits and sounds good in the room, not the force the room aiding treatments to accept the speakers, for example.
While I have to live with the room that I have, I still try to improve it as much as possible, even though I am slower with that endeavor than I could be (and I have nobody to blame but myself).
I went through several listening rooms in several houses. For me the most significant aspect is still room size. I am not sure that my future space (around 60 m2) will be able to accept the XLF, due to its vaulted ceilings.