Sounds like you are being force fed the Crestron kool-aid. and if all of your clients are exactly like the one you refer to, that's what you need, and should sell.

All three of my billionaire clients have asked me to install Savant and dump Crestron. The standard run of the mill millionaires have all complained or switched.

The smaller systems are happy with simple control from and RTI, URC or Savant.