Why are most speakers designed for robots?

As you described this.....

IMO It's not that all the other speaker brands are anything less than fine in their own right, it's just that that were non-optimal in your rig.

Your new-found ones have that the ethereal synergy with the rest of your system that was apparently missing before .

This thread is nothing more than a very biased anecdotal personal fave discussion, Fine....BUT.....

For example, I would never diss or dismiss  WILSONS as anything less than very top tier product offerings. They all have unique sonic signatures.

At the last TAVES expo here in Toronto last fall, it was the NORDOST room showcasing  a well-north of $400K killer system that blew away the rest of the show ..... Full stop.

Of course having the NORDOST ODIN array cabling and very best Dan D'Agostino electronics powering the top-end WILSON speakers formed part of the magic we all heard.

If WILSONS were anything less than the very top tier product offerings available to them , why would they not choose KRELLS or ??? instead for THEIR system (operative words ... THEIR system)
After all, they are a cable company with no affiliation to any speaker brand and available to choose TANNOY Kingdom Royals, KRELLS , KEFs or whatever else....full stop.

There is no outright "best".... Just "better" or "best" tailored (limited) to YOUR system and also affected further by the  warts in your unique  listening environment 

again, in the simplest of terms, system synergy matters ....Big time... Full stop again.