You're free to demand things if you paid for it.

They overpromised on a free project, which you didn't pay for. It's a non-commercial project - I'd give a lot more leeway for that. Otherwise, go to Unity, and see how fast they fix the bugs in the things they promised to deliver.

Moreover it wasn't that they were lackadaisical; they overdelivered on other aspects of the Godot project. Sometimes some pet feature can wait, compared to improvements for other serious features that affect a wider profile (e.g. GDScript, C# integration, and the tons of other stuff in their 4.1 changelogs). Their resolution and closing of issues on the Godot repo is also really impressive and consistent for an open-source project.