So to me, the problem seemed, is that these newer speakers are way too "detailed", at least in the wrong way. They have fancy tweeters. Woofers made of strange plastics or carbon fiber or who knows what...usually in the pursuit of detail and imaging or whatever, or at least to sound "pro". They sound very different to any speaker I've ever listened to music on in the normal world.
The way I think of it, most everything in the domain of the mix is volume relationships. EQ is volume control of separate frequencie ranges. Compression is volume control on the time domain. The faders change volume between elements. Yadda yadda...and if, either realistically or perceptually, volume levels are compressed, you have no good window to view your mix through.
- If you're hearing huge amounts of detail (background information or high frequency nuance or whatever) at a normal listening volume, it will sound full and rich and perfectly fine. Play it on a speaker that the sound has to "punch through" and it'll sound wimpy.
- Since you're hearing so much information presented so clearly, the volume relationship between what's loud and sticks out and what's quiet is compressed (in terms of elements, frequencies, sequential parts of sounds, etc), at least perceptually. This makes them sound "flat and neutral", leading to foolish young consumers gobbling them up and singing their praises while secretly trying desperately hard to "learn" them

Now, these Focals didn't have much bass, but the larger, bassier near fields I've used seemed to have the same problem. And I'm not arguing in favour of using crappy speakers "to make it sound good everywhere" or anything.
Just a thought. Am I off base here?