I have never personally experienced a need for a tool like this, but I think it is a really cool idea and an elegant execution to a very real problem. Best of luck!
I don't think it is and I think it is a good idea. Not every company needs this, and often, ensuring backwards compatibility is preferable. But I can see a lot of very good engineering behind this.
It gives you absolute control over which app versions can run. Force updates. Block broken builds. End backward-compatibility hell.
Also we just launched on PH and would love your support.