and
> trivialization of the effort required
I don't believe this is what's happening though.
Yes, that most people already know WYSIWYG has value, of course. And it takes effort to learn. But people can see for themselves if it's for them. Nobody is forcing anyone to do anything. Most likely, people even starting to read this are probably ones who are already a bit curious or interested in this.
This is for people would could be thinking "HTML is code, it's impossible for me" when really they can understand and like. This things tells them "look, it might not be as complicated as you might be thinking. Try and see for yourself".
I don't see the drawback of doing this actually. I don't see the harm. However, I see value in making people realize that computers are not magic and that they can leverage them in other ways, and putting such tools within their reach.
So yeah, maybe not anybody, but probably many more people than one could think (professional or not).
It's also easy to underestimate people (ourselves included) and to think code like HTML is too complicated to understand for most people. It's actually not. Most people would understand the basics quite easily and making them realize this is quite nice.
What do you have so special that you could learn HTML? Nothing, actually. And it is quite important to be aware of this.