Regarding 2: that is literally how SMS reactions work. Apps that recognize it just interpret it as "put that emoji on that message". It is unfortunate that it doesn't do that tho.

RCS is different, which you can sometimes get working by installing Google Messages¹, which is essentially the only app that supports RCS any more. Google runs essentially all the servers too.

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1: There are no third-party RCS apps² because, unlike SMS which has an API and a shared database on the device, RCS is extremely locked down and it's literally impossible to create one in stock Android. This is also why it's only "sometimes" on GOS, the details are very complicated and rather enraging.

2: Samsung had one, but they're shutting it down in favor of Google Messages. A tiny number of other devices / telecoms have their own too, but they're rapidly shutting down as well. RCS is very nearly fully controlled and implemented by Google now, except for iMessage as a client only, for now, and there's no encryption between iMessage<->Google Messages last I checked (but there apparently is between Google Messages... but no normal person can really verify that because it's Just Google Everywhere).

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rookderby an hour ago | parent [-]

I agree with this post and add one anecdotal data point.

I had installed graphene os on a pixel but after a couple months and a couple loops between lineage, stock, and graphene, I eventually settled on stock android. I have group messages with family and some of the family are on apple, some on android, and RCS only works with google messages and google services installed.

It's infuriating that I can't send RCS messages unless google allows me to. I want to go back to email or MMS. Supposedly after a month (!!) RCS group chats will fall back to MMS, but that was not my experience. Also, if you turn RCS on/off you may get kicked out of group messages [0].

[0] https://support.google.com/messages/answer/7189714?hl=en

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Groxx 35 minutes ago | parent [-]

Yeah, it's pretty awful tbh. I generally recommend disabling RCS, after learning a lot more about it - it feels like a hostile grab at global messaging at this point, heavily entrenched by telecom agreements. Use Signal or something instead.

Initially there were some promising details planned, but much of it hasn't panned out, and plus now it's Just Google™. Like, roughly everyone has heard that RCS brings E2EE privacy, right? Would it surprise you to learn that it was only added to the spec around a year ago, and nobody has it implemented yet? Google has their own thing between Google users, Apple has their own iMessage-only thing, and they both drop crypto when you cross the streams because it isn't in the spec. And neither is practically auditable (allowing auditing is part of the spec btw - have you seen that UI?).

And that's before even touching on the utterly massive amount of the spec that's clearly designed for businesses only, to send you highly customizable interactive UI. Which you can't use as a person. Or build your own app for. https://developers.google.com/business-communications/rcs-bu... / https://rcsforbusiness.google/

It just does not smell good. It's not in our best interests to let it win.

	▲	wolvoleo 2 minutes ago \| parent [-]
		Yeah RCS always has been an embrace extend extinguish thing. The carriers were super pissed to lose their SMS revenue to WhatsApp and iMessage so they came up with this shit to be an active partner in the loop again, and they can bill for it again. Consumers didn't fall for that and it died off. Unfortunately Google revived it but it's a very poor standard for interoperability. Not only because the lack of true E2EE in the open spec but also because you need to be a blessed party to run an RCS server and communicate with others. You can't run your own or choose a party you trust. It's either your carrier if they bother to run one, or Google. It's just another power grab. Don't fall for its 'open' guise.