Thanks for the nitpick. Now let's read this again as "Apps implementing the Matrix protocol...".
If one app found a way to make a nice UX for it, all the others would follow. So in practice it seems perfectly reasonable to say "Matrix" when talking about the general UX found in apps implementing the Matrix protocol, doesn't it?
If one app found a way to make a nice UX for it, all the others would follow. So in practice it seems perfectly reasonable to say "Matrix" when talking about the general UX found in apps implementing the Matrix protocol, doesn't it?