So where is the issue exactly? He used the word correctly as far as I can tell.

Still seems very apt, no?

As for revocation, I have a similar setup and I agree. My worry is that in a theoretical situation an attacker could get access to a network and then spread his key to the entire network and there's little you can do about it. For personal use it's fine (I use it), but because of this, I would be vary of using Tinc for some sort of production use (although I've heard of people doing it). Even if it's a big IF since you need to actually have an access to a node to generate an invite, the attack surface is still there and there's no good way to undo it.

From what I can tell ZeroTier seems nice as long as you're okay with using ZeroTier's servers for things (a curious trend I've noticed - so called decentralised services will always be great until you want to have fully independent servers). Sure, you can find github issues telling it's possible to set up your own planets, but the software seems somewhat complex and there's no documentation for it, and moons (what is with this lame terminology anyway?) will ping ZeroTier by default.

I have that with a bouncer (znc) and a plugin. I've not used it, but it is my understanding that IRCCloud does this too. Problem is that there aren't many easily usable options for this apart from IRCCloud and even IRCCloud itself isn't all that well marketed.

Always seemed kind of weird how while IRC is full with FOSS people who are willing to use their time on various projects they're not getting paid for, most of whom also seem to worry about IRC dying out, nobody is really doing anything about it. A lot of the conveniences we miss could mostly be solved by making modern clients that are actually good.

Weird.