Why not? What can we loose doing so? If some talented developer is going to switch device ("greener pastures"), she/he will do that, no matter if we're going to have talks about it here or not. If someone is going to stay, having categories about other devices won't hurt (and can even help, due to multiplatform projects).

the only thing we need to achieve in such approach, is non-intrusive coexistence. Simple example - "Active Topic" list on the right, adjustable per user profile - if someone don't want to see new topics from some category, it should be possible to set up.

Those are details, but many of them form something called "peaceful coexistence".

/Estel