And admittedly, maybe I've worked with a series of terrible ones, but I've also worked with a lot of popular ones that big enterprises are adopting.
As for open source, I'd say zero percent chance that happens, because no code solves problems developers don't have: (1) I want to write code, but I don't know how to code & (2) I need to integrate a lot of really boring, legacy, usually-Windows apps.
It's the "Why are there no polished open source desktop environments?" problem from the 90s, multiplied by ten.
Which I think is why you see what open source no-code tools do exist focus on web, because that's closer to what their developers are curious about.