Nothing that hasn’t been sorta shared before but just in my own way of thinking about it:
Even only moderately good headphones offer an unparalleled way to get as intimate as possible with the full measure of raw detail that is in the recording.
A good 2 channel speaker setup offers an unparalleled way to go into the image/soundstage/soundspace and at an “adequate volume” (smile) the physicality of the music in the recording.
If possible, I wouldn’t choose to live without both setups being available for their special charms.
Cheers, John