[gyom]

If you want to train neural nets, you can either rewrite everything from scratch and get a bug-ridden sub-optimal implementation, or you can use a kind of off-the-shelf library.

The problem is that there are about 3-5 alternatives out there, and none of them are mature enough or convincing enough to dominate. The field changes so fast that it's easy for them to become obsolete.

What you're seeing here is the enthusiasm of people who really want to get a good tool with proper support, and be able to stick with it. I'm still not sure if TensorFlow is that tool, but it depends on what will happen to it during the coming years.