Moxie (Signal Founder) gave a talk about the issues with federation at CCC in 2020, he took a crazy amount of flak for it, a lot of it from the Matrix community. Lots of the issue highlighted are in this post.
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Here’s his original blog post from 2016: https://signal.org/blog/the-ecosystem-is-moving/
I go back and re-read this pretty much every time a decentralized thing has problems. It rings true.
Just gave it a listen. A lot of what he asserts seems pretty obvious with many examples e.g. the ones he give about IP, DNS, email etc. Centralized movers will always have the advantage of coordination, so decentralized systems have to have a damn good raison d'etre that's immediately obvious (e.g. Tor) or else be eventually consigned to niche use in highly idealistic communities.
These discussions look related. Others?
Why federated protocols don't work (2016) - https://news.ycombinator.com/item?id=30314454 - Feb 2022 (130 comments)
The Ecosystem Is Moving [video] - https://news.ycombinator.com/item?id=21904041 - Dec 2019 (90 comments)
Reflections: The ecosystem is moving - https://news.ycombinator.com/item?id=11668912 - May 2016 (99 comments)
Yeah, but it boiled down to “we want to move fast and modify the client on our whim”.
Which, is fair, but if absolute control of the client is required then there’s no benefit to E2EE.
The message I got was more "decentralized services have major coordination issues that prevent them from adapting to changing needs".
Also a major point in Signal's development philosophy is building a comms platform that doesn't require that you trust them, because the protocol is built in a way that leaks the absolute minimum of data about the user necessary to make the service usable for the general public.