What I do want is multi room/zone Airplay amp. Like 4-8 Zones. Instead of multi amps. So speakers can be all wired from one central place.
That's possible. You'll spend major $$$ on the 4+ multi zone amp. And, if you've ever tried to control a multi-zone amp, even one with just 2 zones, you quickly realized that it is cumbersome at best. Not to mention you'll have to wire your home. If you truly want 4-8 separate locations:
1) Seriously explore Sonos or one of the other whole-home solutions such as Denon HEOS, Bose SoundTouch, etc. It is precisely what they are designed for, and they work painlessly.
2) Just get a bunch of portable AirPlay (or Bluetooth) speakers, there are tons of options from $5 and up.
3) Construct a "whole-home AirPlay system" by purchasing a bunch of AirPort Express or AppleTV units, put them throughout your house, and directly connect your choice of speakers to each AirPort Express or AppleTV. You can use powered speakers or passive speakers with a small T-Amp in each room. This would likely exceed the complexity and cost of going with an established whole-home system like Sonos, Bose, Denon, etc.
While the app is not perfect by any stretch, it really is about as simple to use as possible. Group rooms together, separate them, adjust volume of the whole group or individual rooms, link to your iTunes library, use Pandora, etc.
I said this earlier in this thread. If you have not really used Sonos (and I presume Bose, Denon, etc.), do it, and not just in a store. Sonos has a 45 day trial period and they pay for shipping in both directions, so nothing to lose. BB caries Sonos and alternates too.