Are these environments attractive because boxes and arrows are actually better than characters for expressing programs? Or are they attractive because they encourage you to skip steps that turn out to have been important? Sure, you can replicate a normal, responsible development process with a no-code tool, but at that point do you really have a compelling alternative to a more traditional programming environment?
Without discipline, any programming environment can lead to failures.
It is true that there aren't any well-defined workflows for using an arrow-boxes environments but that does not mean that these environments don't support specific workflows.