As someone who uses a Lumia 950XL as my main phone, and used a Surface Pro 2 for years (only now replacing it with a no-name Chinese tablet also running Windows 10), I have to laugh when people say things like this. Just because computers are now on W10 doesn’t mean the majority of people are using the Store. And even developers who do have UWP apps are frequently deciding that it’s not worth the time to release for phone, let alone someone who would have to start from scratch.
But even if the Windows Store was heavily used by people, how many people want to control home automation from their desktop? Or on their Xbox? Or from VR? Sure, there’s Cortana, but you know a lot more people are using Amazon Echo / Alexa.
Even though SmartThings is owned by Samsung, it always has sounded like they’re still a pretty small team with relatively constrained resources… maybe a bit larger than before the purchase, but I doubt Samsung gave them a blank check. With that being the case, there are far more efficient ways to achieve some of their goals, and there are more important things to be focusing on. Or have you forgotten how much we all were desperately begging them to spend more time focusing on stability instead of reach only a year ago?
(That being said while I understand the decisions, like I said before… I still wish the WP app would keep me logged in instead of having to re-sign in every time ).