Certainly linux has been 'blessed' with many authors trying their hand at software. Some programs have interesting either in utility, speed, ease-of-use, scope etc. Most don't manage everything . Also most don't have the time/resource/knowledge to polish, or even plan how their creation will develop. Many indeed are treating it all as a learning exercise.
However in almost all categories of software there are example that stand out. In the graphics areas I find :-
Kdenlive for video editing
Darktable for RAW photo development/editing
Inkscape for vector graphics
to be exceptionally good, stable and well-documented. There are others, I'm sure, but given the time required to become completely familiar with programs of some complexity/subtlety and indeed the concepts they are implementing I tend to stay with trusted tools for routine use.