That's taking it a bit too far. There are LOTs of things you aren't going to be able do with a Harmony Pro and Alexa. And of course, even if you could, the majority of people who wanted all those other things aren't remotely going to take the time to learn how to do it and then actually do it. So they will either do something extremely simple, do without, or pay someone to do it.

The problem, as with any system, is that it's not just the Harmony Pro and Alexa, it's getting those integrated with all the bits you want to control and to do so in a reliable way over time, which were never designed to work together.

The problem is always too many moving parts from too many players. Or, you reduce the number of players and the price goes way up. There's no open, high quality, ubiquitous backbone to build these systems on, so it's either low reliability or really high cost.

If we had that high quality, open backbone, then all these companies who are incapable of building systems, but quite capable of building components, could target that backbone and we'd begin to move towards a more building block approach to all of this stuff (though compliance would have to be tested, which is another huge complication.) And that would bring costs down all around, while still leaving plenty of room for added value by integrators who put various pieces together for various needs. You could go into an installation with various controller products all of whom could understand the installed gear perfectly.

But no one wants to build the system unless they also get to sell the expensive bits and pieces that fit into it. And I think there's zero chance of anyone herding all of those large cats into creating such a thing for common usage. And of course it would just end up being something created by committee, so full of compromises and whatnot that it wouldn't have been worth doing to begin with (e.g. UPnP.) It couldn't be a scenario where it's about how can we make something that would support a lot of existing gear in a compromised way. It would have to be here is a strictly but openly defined system that you have to completely comply with or not play. And that's just a huge chicken and egg problem that almost nothing can get past.

This is just one of those scenarios where an open market doesn't quite work, despite how well it does in the general sense. There's a big potential market, but we can never really serve it well because that would require a level of cooperation (within a continuing competitive environment) that just doesn't exist.

To be fair, I'm not sure any industry has managed such a thing really. There are obviously lots of standards but probably not at the level required for this. This is way beyond HDMI or having common connection standards and such. Plenty of people could spec out the general requirements competently. I could do it, having lived on the painful end of the interoperability equation for a couple decades. But it'll never actually happen, even if it was someone far more weighty than moi.