Most engineers I've known are enthusiastic when given the opportunity to play around with a new toy. What they don't like is anything being forced on them. There's nothing irrational about that. They've often invested a lot of time into optimizing their workflows.

I've also found that if something actually makes their work easier, you will never have to twist their arm to make them use it. They'll apply it everywhere it helps. They'll even try using it in places and in ways it was never intended for. If they're digging in, you likely haven't made a very compelling case for your changes.