But that's what so insidious about it - by also actively degrading the chat experience it makes excluding non-Apple users not merely social signalling but also a rational decision even if you don't care about conspicuous consumption whatsoever.

So pick your poison, either you exclude them because of in-group signalling/conspicious consumption or exclude them because you want non-potato resolution, with Android users getting the blame for Apple's UX. Either way Tim Cook says the solution is to buy an iPhone.