The habit of expecting/listening for imaging, when sitting centered is in-grained, must be overcome as you say.
After your system is analytically adjusted, and a particular LP/CD/Streamed Track has been ’inspected’ regarding content and how well it is recorded, then knowing what’s there, it’s time to ’let go’, simply enjoy what you know is coming.
Related, is listening to Mono recordings.
I learned here, and implemented:
LP: Stereo Cartridge using Mono Mode on pre-amp is not as good as a Dedicated Mono Cartridge. Mono cartridges avoid any vertical artifacts that Stereo cartridges react to. Those artifacts are more detrimental than I realized.
Next: use only One speaker.
Finally: Listening: get OUT of your primary centered listening position. as the main point of your thread implies.
Mono recording in the 50’s was quite good. Rather than imaging, I find a proper Mono cartridge produces cleaner distinction of individual instruments, players, which adds greatly to both enjoyment, and hearing the greats when they were both young, coming up, creating their individualism.