It pretty much sounds like you've pinned yourself in to a phone app (or push button devices) to control your audio. That's not so bad.
Well, for the whole house audio, a mobile device makes sense. When it comes to high end home theater audio, not so much. There are a lot of speakers in the house. Not just the ones in the ceiling.
Don't worry.... once the economy turns around.... technology will out-date your system in short-time anyway. I don't really know if Home Automation is a hobby, or a lifestyle. But either way.... it's NOT static.
Speakers that I have in the ceiling will continue to be driven by amplifiers. Amplifiers are power hungry, when you are talking about 16 pairs of speakers. Some kind of power management is required. I'm using old dumb receivers picked up for $100 or so with 5.1/7.1 multi-channel inputs.
I haven't changed the amps since I bought them, and it's been a decade. I do have Chromecast audio connected to the amp inputs, whereas I used to have CD players connected, and an RF remote control.
The CCAs afford many more possibilities, but they have already been obsoleted by Google. And there are a lot of unfixed bugs. At least with the CD players and the remote control, I knew what the limits were going in. There were no Wifi AP/router firmware updates, phone firmware updates, CCA updates, to mess up everything randomly every week of the year.
I pretty much wasn't using the audio system with the CD player/remote because it was too cumbersome to change disc, and one was driving the system "blind" with the RF remote - no feedback at all as to what was happening. Eventually the CD players died due to dust and cat hair, and I replaced them with CCAs.
I use the audio system more now with the CCAs. I am not happy that it's dependent on the cloud for almost all tasks, though. And it's just not smart. Audio apps on the phone don't know that they need to turn the amps on to play audio, much less which amp to turn on. The smart speaker vendors solved this by integrating everything - the streaming source, amplifier, and the speakers. That's the opposite of hifi which is by definition modular, and where you can swap/improve one part of the system without affecting the rest. All these new smart devices do is lock you into using a single hardware vendor and specific cloud services. And that's just downright terrible.