I wouldn't put this anywhere near the same category. Windows RT was a moronic idea in the first place, seemingly a result of Microsoft's total confusion about how to approach the mobile PC market and Intel's lagging Atom performance. As soon as Cherry Trail got rolling, RT was kicked out the door. Microsoft was dumb enough to have 2 ARM operating systems, one of which looked identical to the x86 OS and had almost none of the software support or functionality. It was a conceptual disaster, and that was STILL better than how it actually went.
The Band devices fit into a totally different reality. They don't overlap with in-house products. They don't struggle for an identity. They aren't overpriced or functionally disappointing. It's hard telling how the W10 IoT stuff is coming along, and I don't know how MS will attack it in the future. Dan's last video said the OS wasn't reliable enough for the Band 2, but I'm not sure if that was an OS problem or a hardware power problem. If W10 IoT needs to mature more, MAYBE we see an update that gets it onto the Band 2 next year, to help it roll on with the rest of the platform.
Regardless, I don't even think Universal apps are meaningful here. Unless it's a social network or NFC-based shopping experience, it doesn't have much use on the Band. For example, what's a ported-over app like Xbox going to REALLY offer you? A tiny, clunky display for hardly any info? How about the Office suite? I just question how much of these apps going to wrist devices are there for function and how many are just hitting a checklist of features to get fans excited for ideas that'll fall flat.
The one thing that would be really nice is if they tied Microsoft Health & Fitness (with the Band) into the Xbox Fitness software on Xbox One. Adding that next level of biometric reading to your console workouts would be sweet.