I don't get it. Why are they incompetent? From the article it only seems to be because they didn't include features that other Windows Managers have. GNOME is

I don't get it. Why are they incompetent? From the article it only seems to be because they didn't include features that other Windows Managers have. GNOME is not Windows WM or macOS WM. There might be things that you are not used to, when you come from one of those worlds, but that doesn't make them wrong. It would be wrong if the feature was there in the past and removed it without guiding the users (via UX) to an alternative. IMHO the author shouldn't complain about the design choices of GNOME by comparing it to other WMs. There isn't a reference WM that everyone needs to stick to (thankfully!), so a missing feature compared to macOS / Windows is not a wrong thing.