2 points
Again, having third party clients would not definitively mean the client is bad. Obviously, if it’s a simple fork with hopefully small patches that are just UI changes, it’s probably not going to harm the security model.
I should have phrased this better in my original post. When I was thinking about third party clients, Matrix and XMPP immediately came to my mind. Not very simple forks. So I’ll phrase this better: “Having non-trivial third party clients is not good for security.” What non-trivial means is left to interpretation though, I suppose.
