The Yamaha A-S801 has a variable loudness feature. It’s not as fancy as the options listed by the OP, though.
Choosing an integrated for low volume listening
Is there anything in the Amp - Speaker combo that makes one combination better for lower-volume listening? I would guess the variables are Class A vs A/B, speaker sensitivity, and current.
Room: 13’ x 13’
Stand mount - Aerial 5T (I think)
Integrated options: Pass Int-60, Lux 509X, ML 5802, Lux 590ax II
Overkill for the space - nope, love it.