It matters, because it’s not about messages, it’s about the interface and all the logic which was built over a long period of time. Having an OS-native gui is better because it’s faster, it’s “already there” and not just loads, and it’s all done in the desktop app already.
As a good comparison - what would you choose for any service on your smartphone - an app or a really nice mobile website?
Of course there are fucking details attached! Ukraine is quite attached to its territory and survival, Greenland is attached to Denmark, healthcare and social security, Canada and Mexico are attached to the idea of not having an asshole neighbour. It’s like every situation has reasons under it, what a surprise!