1 and 2 make perfect sense and are easy do demonstrate but 3 seems to me to be incredibly difficult.

I haven't found an easy way to advertise convincingly to somebody who (quite reasonably) grants you a limited amount of attention that custom things won't be a nightmare. It's the kind of thing you only tend see when you get dug in the weeds and hence people will tend to make assumptions based upon surface details.

This is a problem I'm struggling with.

I think robot/cucumber could require less code if they were better abstractions (and would be more loved), but I find it hard to illustrate that an abstraction is going to be good or bad, particularly to people with limited attention and particularly to people who don't necessarily have the skills to recognize a good abstraction.