I normally run a 5.1 system primarily for music.

My surrounds are currently on loan to my parents as an experiment.

I'm VERY surprised how flat and sterile my system now sounds without the surrounds.

I had no idea how spoiled having surrounds had made me. M's Trifield is a wonder.

For everyone who runs a stereo pair or LCR-only arrangement, I can't recommend strongly enough getting to a dealer, and doing a good long listen to a surround configuration.

Living room: 818v3, Parasound A23+, Maggie 1.6
A/V room: 861v8, DSP7200SE L/R/C, 4x DSP320 surrounds, ID41 + Roon, UHD722, Prime+PS