Sketch and Pixelmator, to me, operate in a significantly smoother way, and make doing basic tasks substantially easier. The biggest thing that comes to mind for Sketch/Inkscape is exporting sections of the larger project file into individual assets. It's a breeze in sketch. It's integrated in the main UI, it operates in a predictable way, and it just works. Inkscape pulls you through a series of menus, and doesn't have any way to remember how you've previously separated up your assets (unless there's some way to do that deeply hidden in the UI that I could never find).
So yes, Sketch and Pixelmator, and most well-known creative software (anything in the Adobe suite, the Affinity Suite, etc) is generally significantly ahead of the open source options. Would I prefer it otherwise, sure, but the open source options aren't used by that many professionals, and are generally swimming upstream to implement features the commercial ones already have, instead of creating the next great feature (whatever that is) or streamlining their UI to make easier to use.
I've tried darktabke and the UI is a mess, same with Gimp. A lot of open source software is unpolished and lacking in documentation. If that is elitist so be it.