I think it does at least 3 things well: 1. It lets developers familiar/interested in the tech to know that you use it and that they should apply there. 2. You

I think it does at least 3 things well: 1. It lets developers familiar/interested in the tech to know that you use it and that they should apply there. 2. You've done the work to research it and make the decision to switch - it doesn't hurt share that. Who knows someone may point out some flaws you didn't expect. 3. It increases the inertia of the technology. There are strong network effects in technology and if everyone sees that something is growing they'll make the jump too. One new library created per X developers is a big win and makes it better.