Yeah a lot of headphones can lose that sense of space or become super wide, and sound very unnatural with regards to details, with music made to be listened on speakers, because there are no reflections, at all. The drums on metal and hard rock go to mush quite often. The Harman target can help, but still.

And as you said, listening in a room full of reflections is no better either. Just another extreme. And treating rooms is expensive unless you're fine with old egg carton boxes everywhere.