It is true generally that we can hear more details with headphones...
The problem with this "truth" is that this truth is an "half-truth"...
And half-truth are more deceiving than lies...
If the speakers are not well chosen and if they are not imnplemented correctly in the room acoustically electrically and mechanically, yes they will give way less details...
But it is not true for my speakers now in my actual controlled room...I have the same level of details in my listening position than with my headphones...And probably an improved way to present these details than with an headphone...
then.....