No, we should stop dumbing down UIs to the lowest common denominator because that's how you get user-hostile software that treats users like sheep to be herded and monetised.

The less you encourage learning and self-improvement, the less it will happen.

You get user hostile software that treats people as sheep to be herded and monetised because of the capitalisation of software, not because designers are making their interfaces too easy to use.

Don't blame designers for that, blame VCs and Silicon Valley.