So like you said; I believe you still need to be a dev to deliver with these systems; 'end user programming' is not close outside Excel. People who know nothing about programming will generally make complete monsters with these systems, even after training (I saw it a lot with Outsystems when I click open a business flow).
Real enduser development revolutions we won't see this low-code wave, maybe the next somewhere around 2030?
Right. And that probably applies to many, if not all frameworks, by virtue (vice?) of their design. I don't know Mendix, but I've worked on programming frameworks like Rails, Flask and others, including some in-house company proprietary ones. You sometimes have to work around their limitations with custom code, awkwardly, even Rube Goldberg style at times.
And there can be instances or even categories of apps that can't be done using the framework at all.
The framework giveth and the framework taketh away.
However, I do think that you still need a dev mindset, with dev experience, to use it well. Principles like DRY, loose coupling, code organisation, consistent and informative naming, concise logic, etc adhere just as well. Those hard to transfer skills you build up over time. Although a junior may get things working very quickly, keeping things maintainable and extendable is just as hard, or even harder.