Yeah, for TensorRT it needs the dlls from a github-repository, which are 103MB. I sadly didn't find a provider for OpenVino and MIGraphX doesn't exist on Windows. It is a Linux only library. But I think with tensorrt, most of the people would be fed, I don't think, many people use Intel GPUs.
Yeah, but It's also possible to download the tensorrt provider and put in in the right places with a c#- or gdscript-script, so that should be easy. There ist also an github-api to check the version of the current release, so it should be easy too, to check, if a new version is available, without any user input needed outside of the app.