I cancelled my order before it shipped from Amazon, thankfully. Instead, I ordered the Sinope thermostat (also Canadian FWIW) and have been really happy with it. It uses ZigBee so it’s a direct integration with ST and has a DTH from their website. The UI is a bit more traditional but honestly, it looks great on the wall. Plus, they are releasing a radiant floor model in January 2019.
The issue here is that Mysa is doing what a lot of startups seem addicted to doing: try to create something that will work on its own and then create a bunch of integrations they control. Unfortunately, creating those integrations and dealing with all that pulls at the same engineering resources as product development in a small company. And of course new features always win because that means new units shipped and/or impresses investors when you’re bucking for an acquisition.
I have another IR and RF-controlling device that has the same never ending “it’s coming” message around ST integration and other things and if they only had integrated ZigBee or Z-Wave it would all be a non-issue. And of course if that other company or Mysa go belly up, since they have chosen to be cloud-based only, you are as they say, S.O.L. If they had both WiFi and ZigBee/Z-Wave (such as Halo fire alarms do, which did go belly up this summer) the devices still work minus the phone app since ST has control.
I too really wanted to like this based on the marketing, but I think you also made the right choice.