Definitive pioneered combining loudspeakers and subs in the same cabinet for decades and Golden Ear is doing this as well. I haven’t seen any complaints about them.
The optimal location for a subwoofer (low bass transducer) is usually never at the optimal location for a speaker (imaging and so on). The primary objective with a subwoofer is to get it married to the room...not anything else...
Golden Ear didn’t defy any physics and produce some kind of acoustic miracle.... What it does is a awkward compromise to cater to some low info dinosaurs who believe music listening should be done without subwoofers...
If you are placing speakers on top of a sub (at the same spot), it is a wasted opportunity in most circumstances.