I think this developer fails to address a major concern - companies looking for industrial control software want support. From the page, it looks like your support options are two guys, one in Germany and one in Poland. That would be an immediate non-starter for our company.

The alternative would be to hire one or two developers on our own for support, and then the cost savings would be out the door. Maybe this library is more performant, but it's a (relatively) small piece of the industrial control scheme. A massive shift like this is just not something companies will take a risk on.