Really?
That’s strange.
I have exactly the opposite experience.
Headphones for me (ancient Sony MDR-V900s - LOVE them, if they break I’ll have to quit the business) ) are like a microscope.
I can hear EVERYTHING - way back ear candy, verb flow, etc.
I too, like Curteye, use them for placement and spotting small things . . (that one extra Tamb Hit that’s not supposed to be there even though it’s 30Db down . . ).
But occasionally, like mixing a live show for Video from a dressing room with the Director next to me screaming at cameras - I’ve HAD to use them.
And I’ve found that low level but necessary stuff - Audience Sounds, Room Mics, background parts, etc. - I tend to mix too low in phones.
So I’ve learned to compensate.
But, you know, a lot of people listen on (sometimes nice) earbuds now . . so I suppose it’s a good thing to check.
Hugh