[beefield]

I think there should be a clear distinction between your tools and... let's call them "utilities" what comes to UI. It is perfectly okay to make electricity plug, water faucet, toaster and the power button on your computer not only so easy that an idiot can use them, but so easy that an idiot can't use them wrong. Not only because requiring mental energy to use these is irritating but also because it can be dangerous.

Your tools, then again, chainsaw, microscope, text editor... have no reason whatsoever to have an UI that is intuitive without training[1]. Because without training you are anyway going to be either dangerous, useless or in best case just really unproductive.

[1] of course, the UI needs to be efficient after training.

[ghaff]

And, in the case of things like chainsaws, they shouldn't be needlessly dangerous if a user is not as well trained as they should be or if they're simply inattentive/tired/etc. (And in the case of software, you should generally not be able to cause massive damage/loss of work because you picked the wrong menu item.)