Does Time alignment and Phase coherency make for a better loudspeaker?

OP

Caps lock key broken?

Angeling the speakers back reduces 1st reflection problems, ....it isn't time aligned

Listen for yourself.

I'm afraid that while much is made of it, I've heard time aligned and non time aligned systems and... MEH!

For me it's not the convincing superioiur sound experience the vendor's claim, and acousticians I trust say the same.

That's not to say there are not some very excellent time aligned speakers.  The top of the line Vandersteen come to mind.

Certainly it makes for better sound staging and imaging.

...however, there are varying degrees of what the industry describes, for example, as "time alignment" out there. It can sometimes strike me as more of just a marketing thing...as though either the makers think that at least half the buyers don't really understand what a proper time alignment can attain...or that half the makers don't understand it...or both maybe, IDK. 

Everybody has their own way of making and selling speakers, or choosing them FTM. But IME when you technically do this topic justice, you do get some pretty good rewards.

Eric - yes and as you no doubt aware, there are lots of other fundamental design principles at work; pistonic drivers, matching of drivers to within .25 db, testing the assembly in aneochic chamber against the reference, cabinet within a cabinat, high pass filtered midbass and up, same transfer function for main amp as sub amp, 11 bands of EQ below 120 hz for best image placement vs eliminate bass issues and live w image....the list goes on, since 1977

Not for everyone