> As an example, instead of starting another desktop project (lxde, razor-qt, lxqt), some could have contributed to or collaborated with xfce.
As a former Qt (and KDE) developer, I can very much understand wanting to develop with the language and framework you're intimately familiar with. At least at the time (~2010), C++ with Qt was light years ahead of C with GTK.
Absolutely, but you'd be a nice guy if you factor out the essential and common parts into C libraries, so that others can make use of it as well (from any language and framework) which increases collaboration and decreases fragmentation.
Some might see the need for C libraries as evil and unnecessary (I personally don't), but it's the situation we're in.
