On the one hand, it's understandable being tired of seeing mods in development that then don't get released. There are some mods that I really liked to have come out, but didn't. On the other hand, however, we have to be in the mods developers' shoes. Modding is not a paid job, it's done in the free time they have. And as anyone else, they can get tired of what they do, of the projects they're working on, and want to put them aside to do something different on the game, or just stop modding for a while. Or maybe something has happened in their social life, family, jobs, health... that is more importante and has made them change priorities. Or they can simply have less time.
So, be respectful, these people spend a long time doing this stuff for free, with the time they have available, and telling them what they should do with their very own free time, or with the old version (which in my case is unstable and has performance issues), is going to do nothing but burning them out and discourage them to continue.