Okay I'm out of the loop, why is iMessage on Android such a big deal? I know that images get compressed but it sounds like Google and Apple are finally working together to draw up a spec there. Besides that it's... A color difference?
There's a massive cultural thing in the US about the iPhone being the preferred phone and if you don't have one it must be because you're too poor to afford one. Obviously this is a result of marketing and isn't universal but it is a surprisingly widely held view.
Given that, showing up in a group chat as a lone blue bubble marks you out as the inferior group member (in some people's eyes). It doesn't matter so much 1:1 but if there are 10 people the odd one out stands out.
The real issue here is that people in the US are tied to using SMS for real-time chat groups when so many better (and private, and well known) alternatives exist. Thankfully, in Europe, nobody so far as I know ever really uses SMS anymore – whether for single or group chats.
I think this is the primary reason. Apple only announced working on RCS support very recently. Once that’s out, I don’t really see a place in the market for this.
And it isn’t just compressed images. MMS doesn’t support reactions, replies, typing indicators, or read receipts because it’s ancient. A proper, standardized replacement has been long overdue.
Granted, I’ve heard that RCS is currently heavily reliant on Google’s own servers, so it could be argued as to how “open” this really is.
I think the currently available apps not being free software is less important than the protocol being open, which is good. It allows for the possibility of FOSS clients in the future. My bigger concern at the moment is if most/all of the actual backend infrastructure is controlled by a single stakeholder.