I think the biggest problem with this approach is at some point, they necessarily reach a level of complexity that it takes the same amount of time to learn how to use their "no-code" tools than it does to just learn how to code.
They also need to invest heavily into UX and the ease of figuring out how to do something. I've used Bubble and similar tools, and they share something in common with coding - you need to watch/read a bunch of tutorials to figure out how to do what you need.
What they save is an initial headache of devops / authentication / wrangling which is bad enough as a programmer but extra hard for a non programmer to contend with.
Here is another idea for someone - a yes-code tool that lets you write everything in code, but handles devops/authentication and some common stuff for you. Basically Heroku + some NodeJS starter kit that is meticulously kept up to date.