> "At least as standard" how?

There are 8 people who vote on changes to the Matrix spec (the Spec Core Team), 7 of which are Element employees (including Matthew, Element's CEO). Element also controls the development of clients and servers used by the large majority of users in the public federation.

The IRCv3 working group is made of plenty of organizations (non-exhaustive lists at https://ircv3.net/participation / https://ircv3.net/charter) with at most two "representatives" each.

> A substantial portion of the IRC comunity is actively hostile to the IRCv3 extensions, and in some cases prefer incompatible implementations of the same functionality; Matrix has nothing like that going on.

But any IRC client will work fine on any IRC server, and they can simultaneously connect to various servers which support variants of the protocol (eg. through capability negotiation). Also note that 75% of servers support IRCv3 capability negotiation: https://www.ircstats.org/server-features/cap (and the others are often at all not developed anymore)

On Matrix, clients (generally) can only connect to one homeserver at a time; which forces them to converge on following the same spec. And if your server differs ever so slightly from the other ones in how it implements some parts of the spec (room consensus), then it can be split-brained from the rest of the federation. Instead, changes to the room consensus are done by pushing new room versions, and each server implementation needs to explicitly support it or they can't join it. This means Synapse devs (which are a majority of Element employees) get to decide what room versions can get traction.

It is not uncommon for people in the Matrix community to complain about this and Element keeping specs in limbo, and PRs to the flagship clients being stuck in "design review tar".

> And there seem to be more visibly independent implementations of Matrix than IRCv3.

Clients, maybe, at least in the number of implementation. It's hard to find stats of this, but I feel that >95% of people in the public federation use Element even in tech-y rooms; IRC has a healthier mix of major clients (weechat, irssi, IRCCloud, Hexchat, KiwiIRC, The Lounge each have >5% of desktop/web users). But I admit that's just my very subjective point of view.

In terms of servers, Matrix has three open source ones as far as I know: Synapse (controlled by Element), Dendrite (controlled by Element, and almost on par with Synapse according to https://arewep2pyet.com/ ), and Conduit. Based on https://gitlab.com/famedly/conduit/-/milestones/3 , Conduit seems to be far from implementing the spec yet (eg. it doesn't seem to support leaving rooms or respecting history visibility). And I can't think of any non-Synapse server, besides Matrix devs self-hosting.

Meanwhile, IRC servers: https://www.ircstats.org/servers (note: this counts servers and not networks or users)

> things like: server-side history extensions tended to mess up my client's history implementation (I'd end up with multiple copies of the same messages in my local logs, often with the wrong timestamps)

You can use https://ircv3.net/specs/extensions/message-ids to deduplicate them.

> And if you're in a conversation where people are using embedded gifs, then fundamentally you'll always be a second-class citizen if you're trying to participate in that with a client that can't display embedded gifs.

A conversation where people are using embedded gifs will exclude me regardless of client, because they are too distracting. At least on IRC I can expect people not to do it too much, and use words or emojis instead of reaction gifs.

Speaking of which, Matrix does not provide a way to provide alt-text to images and videos, which ends up excluding plenty of people as well. (To be specific, the spec technically does provide a way, but clients use it for filenames instead: https://github.com/vector-im/element-web/issues/22100#issuec... )

> SSO access control; you just can't do that in a nice way if the client doesn't support it

That's a fair point; IRC is made by hobbyists more than companies, so that's not surprising. There is some discussion around it though: https://github.com/ircv3/ircv3-ideas/issues/74 and Sourcehut is sponsoring design and implementations (https://emersion.fr/blog/2022/irc-and-oauth2/).