Are Multi way/xover type speakers ~~Flawed~~

NO!!

Nope good stuff. 

Not at all. Anyone with an absolute opinion is absolutely wrong LOL.

I own four pair of speakers in different systems. Three two-ways with crossovers, one pair of single driver no crossover. They are each exceptional and match well with my associated gear. 
You evangelize from a podium that your way is the only way but your descriptions of your various experiments are uninspiring.  I’m sure you are having fun and enjoying your journey, which is all that matters. Peace.

pair of single driver no crossover.

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Which FR do you have.?
Have you tried the Davidlouis?

WEll I post what I think, my opiions, Both the good and the bad of each experiment.
Folks can take it as it is.
Wonder why others have not followed my suggestion and try adding in a  FR as midrange. 

I preach what I know is true based on experiences. 
Stereophile propaganda-ize their favorite xover speakers.
Each his own I guess. 

Which FR do you have.?

Shindo

“ two men say they are Jesus, one of them must be wrong “….

Speaker System: Bass Reflex, Rear Vented Recommended Amplifier Power: up to 250 Watts Impedance: 8 Ohms nominal / 4 Ohms minimum Frequency response: 31 Hz ~ 23 kHz +/- 3 dB Usable Response: -10 dB Anechoic @ 26 Hz Anechoic Sensitivity: 92 dB

Components: 1" Aluminum Dome Tweeter 5-1/2" Ribbed Elliptical Surround
Two 6-1/2" Ribbed Elliptical Surround Woofers

2 speakers in a typical room: 95 dB Crossover Points: 600 Hz and 2.4 kHz

Dimensions HxWxD: 39-7/8 x 7-3/4 x 15 (inches) 100.4 x 20.9 x 39.6 (cm)

Weight: 59.6 lb / 27.1 kg
Finishes: Black Ash; Cherry; Rosenut - Real Wood Veneers Inclludes: Spike Kit, Rubber Bumpers

 3 way. best speakers ive ever heard (with one small exception - Dynaudio) price & sound not worth the extra $


 nope, best speakers ive heard are all 3-way or 4-way.

 the single drivers, with acoustic, folk, some light rock are PFM for me, but would rather have the volume as i primarily listen to metal/rock

 heard those odyssey speakers, the soundstage from only a small driver and tweeter was stunning. but, could not handle rock/metal played loud!
if i had a only acoustic rig, classical, or light rock, these would be on the radar.

 metal/rock is best served loud with a cold Guinness and some Irish Cheese & black pudding!

 if i ever have the money, I will be looking at Dynaudio.

 still want a pair of those acoustic energy flagship towers.
almost no dealers, and i will NOT ship audio ever again.

“ two men say they are Jesus, one of them must be wrong “….

Or both?

nope, best speakers ive heard are all 3-way or 4-way.

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Yes
Look at all the big midels from the most popular labs. Wilson
Dali, Sonus  Faber, Tekton all sport multi way speakers.
I hit on the idea of combining FR + xover types via several influences.
My tech geek isa   electronic savant, designs  amps, can repair any amp, and some of his genius rubbed off on me.
He taught me to think outside the box.
So I did.
But this influence came AFTER I invested big bucks  in the Thor overhaul.
This disaster made me angry. 
So I began looking at other designs/possibilities.
I asked him abouta  Seas 3 way witha  Seas dedicated midrange the CH15001 0r 002 in a  3 way.
**you gotta be joking?~?~*
After reading this message I completely droped all ideas  fora  3 way xover thi9ngy.
And put all my attention into these **odd, unusual, strange Full range speakers**.
Order a  pair,,hummm interesting,,, another,,OK nicer,,then another and,,,,so on,,, Then I placed 1 FR on one channel  the hot rodded Seas Thor on the other.
Blown away. 
I went all in for FR.
Thats how I came up with my
FR duo + xover speaker as a  
3 way.
About to add in the DLVX6 to the mix.
Making it a  sort of 4 way.
Multi speakers is  the best design by far.
The music completely opens up, blossoms. 
A single AER or Voxativ w./o any other speakers as assit, is not going to make a  rich soundstage. 
With a  single FR its a absolute must to intergrate  some type of woofer (Not sub woofer PLEASE yuckkky)  and any tweeter you choose. 
Run the woofer up to say 500hz and tweeter down to 5khz.
I run my W18's up to 1800 with a  Mundorf 10uf cap and just swaped the tweeters cap from a   2uf to a  8 uf, which made a  significant gain in tweeter's ambience.
Good luck in your speaker adventures. 
Your speakers are only limited  to the degree of your creativity.