The low code advantage becomes much more marginal in your case. I’ve used these tools in the past and they have lots of dead-ends where you expect to be able to do something, and you just can’t.
If low-code means you learn bubble in a week and can have a prototype in 2, versus just spinning up a simple JS prototype in a month, I’d go with the JS every time.
I think retroactively trying to apply frameworks to successful household names can be an exercise in overfitting. Coca cola sold a tasty drink that people liked and was different to what else was available, they then ramped up manufacturing and branding better than others. I don’t think it solved any particular problem.