Boomieness happens when someone hasn’t run REW on their system and confirmed the (size/dimension driven) room modes - and corrected for them.
The reason big speakers appear to produce them, when smaller, speakers don’t in the same room- is it a small speakers roll off sooner, so may benefit from the additional reinforcement below 100 Hz- even if peaky.
And although not everyone has room correction DSP in their pre-amp, if you’re using Roon, you can add it there- or more importantly, for this conversation “subtract it there”
Narrow Q cuts aligned with your measured room Modes do wonders for full range speakers and subs - anyone who would invest big dollars for a truly full range speaker - should also set aside the time for this step (And room treatments)
TLDR boomieness isn’t inherent in big speakers - it’s a function of your room - and it is revealed by them.