Why don't speaker mfg list amps and associated equip they use to " voice " their sound?

Why stop there? Why not have them list all the cones and footers and shelves, room dimensions and acoustic treatments, speaker locations and listening positions, on a spreadsheet showing day to day so we know exactly what was the setup when each capacitor and wire and screw and grill was tested? Don't we need to know these things? What design software was used and with what settings? What microphone and who did those response measurements anyway? 

Probably the whole thing should be on video, to go along with the 50 thousand pages of equipment setup notifications. 

Or we could just listen and see how they sound.

Hmmmm, dunno. Tough call.

It's a Show and that is what they do . Show and make sales.

It's much more complicated than the simplistic answers here. 

Plenty of speaker cos. have branched into amps - Quad to Sanders.
Not so much vice versa - PS Audio

This is where "expert" advice (magazine, internet reviews, dealer advice, etc.) and 30 day trials come in.  I agree, though, that suggestions or recommendations from a manufacturer concerning match-ups would be worth considering.  The recommendation wouldn't necessarily be exclusionary, either.  The manufacturer could easily hedge their bet by saying that any quality component would be fine, but that Blah-Blah-Blah components would be exceptionally wonderful.