Microsoft’s self updating desktop apps (Teams etc) switch silently on restart. Unsure about their store apps but I imagine it’s the same thing.

With older windows desktop apps which install to privileged locations like %programfiles% it’s more complex.

But that’s the point: snap is a new system. It should be well designed because of it, and be on par with “modern” install systems. It feels strange if they restart for no reason. And it feels equally strange if they have a design that requires it.