Interesting thanks. I interpreted "lightweight" to mean available features. i.e. just the persistent connection, none of the other bloat[1].

[1]: to be clear, I don't mean "bloat" in a negative way. I'm a long time tmux user and I love it, absolutely love it, and won't be giving it up anytime soon. I don't personally think it has any bloat. But, I use the features. If one only wanted persistent connections, then all of tmux is quite a bit of bloat. It's all perspective.