yup, `sudo tinc -n %VPNNAME% invite %CLIENTNAME%` will generate an invite URL on the server side and `tinc join %INVITEURL%` will let you join it. It's definitely really easy now, but unfortunately it's being marked as a pre-release which sets tinc back a bit imho.

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.