I'm not against adding this, I just wonder how to do it "right". Because all those software projects mentioned follow the different convention of having one main container window, and each project is a sub-window of sorts in the main window. When you close a sub window, the application stays open. If however you close the window using the window close controls, it will in fact close the whole applications, sometimes with warnings that you will be closing multiple documents by doing this.
Presently, Inkscape only has window controls, and calls up a new main window for every new file opened. So there are two potential "fixes" for this:
1. Inkscape opens a new document when an edited document is closed - this is easy, but annoying if you don't want a new document. This already happens when ctrl/cmd+w, but getting Inkscape to not close when you use the window close buttons (which isn't great UX imho) may be more of a problem.
2. Inkscape needs to become a sub-window style UI where documents are contained in it, instead of floating around with their own toolsets. Although I typically like this style better, it's a lot more work, and our resources are limited as of now. Often when embarking on a project like this, we are sacrificing time working on other big ticket items. So it comes down to finding someone with loads of time to fix for what I'd consider a relatively minor annoyance.
It's neither lazy, nor arrogant, it's just limited resources, and demands on our dedicated group of awesome developers.
My 2p.
-C