when an audio system is not well under acoustic, mechanical or electrical control by the owner ....
Then the "many reference point" need to be acoustic parameters not branded name products mainly save if instead of creating an audiophile experience you want to sell gear pieces as solution😁...
You seem to be real confused again 😖...Irrespective of whatever "acoustic/mechanical/electrical control" you acheived/tweaked away as an "owner"...well, you, didn’t really achieve a whole lot there because it’s the soundfield produced by a speaker that interfaces with the room before it hits a listener’s physicality.
For instance, that soundfield is drastically different for different types of speakers. For example, a large PA horn and a smaller concentric driver design tend to be drastically different in that manner. Whatever "acoustic/mechanical/electrical control" you achieved got thrown out the window (start all over again) when a drastically different speaker showed up.
The multiple reference points are directly tied to the gear! The "acoustic parameters" change each time for everyone, except for the 1 trick pony.