Well, that just makes it worse! OP strongly implies that there is no good variable-speed solution, but if the industry already has an assortment of products, what exactly are they even selling?!
So basically, the premise of this product is that the proprietary system they design will be nicer than the proprietary systems HVAC manufacturer's design. That's probably true, but as an owner of a Carrier proprietary system, it's totally fine.
Only problem, their thermostats and apps really suck.
There are few off the shelf AC thermostats that work with most heatpumps: they are usually the on/off variety.
Remotes coming with heatpumps would do the right thing, though, and there are IR blasters that can replicate those signals and integrate into your home automation system.