My main take away - so far - is: I voice my observations in terms of usability of KDEnlive and I get very lengthy explanations (also from massimo):
- why things are the way they are
- why it’s problematic to change them
- why things are good the way they are
- why things shouldn’t be changed
Maybe it was a misperception from my side, but it didn’t feel like a very open-minded atmosphere to discuss UI enhancements.
It’s great to hear that some of the points resonated with you and I am happy to outline more observations.
As I mentioned several times, I don’t think that KDEnlive is lacking ANY functionality to be a great NLE already, it’s lacking the user experience to be a great NLE.
I can understand that people have been using KDEnlive exclusively for years and they got used to it’s quirks, which might make them a little blind to the fact that a lot of things are not very logical in KDEnlive or could be more consistent, easier to understand intuitively etc.
Thats understandable and it will be a pain for those “experts” if things are changed. That’s lies in the nature of “changes”.
I do think that I am in a position to see UI aspects in a more abstract way then a hard core KDEnlive fan. As a professional freelance editor, NLE software has been tools I have been using for 3 decades. Since my clients each came with their preferred tool, I needed to know and use them all. I can see the advantages and disadvantages in each of them and I don’t belong to any group of “fanboys” of either. There are clever UI decisions in all of the major NLE (Premiere, Resolve and Avid Media composer) and these companies are doing extensive usability studies and work with professionals from the area. Furthermore, there are things they all handle the same way, because it simply makes sense (like 3 Point Editing, Trim Modes, J-K-L as playback shuttle keys etc.pp.) So I think it would be wise for KDEnlive to take inspirations from the best UI ideas of each of these tools.
So, do I really need to know on which software library KDEnlives media engine is built on, to make a remark that using “Stabilize” on source clips doesn’t really make sense? I don’t think so.
I am happy explain in detail why a UI offering stabilization on a source clip doesn’t make sense. And then the KDEnlive experts can think, if, with the existing underlying technology, it would be possible to move stabilization from being a source-clip effect to being a timeline-clip effect. If not: so be it.
But why make it so hard and at every step again explain to me that KDEnlive does things great and the other NLE are mislead.
I am sorry if my remarks were perceived as disrespectful, that’s not how I intended them to be but that’s not how I felt I expressed them.
If being “a teamplayer” is only possible by tapping each other’s shoulders and saying “we are doing great”, then I don’t want to be teamplayer, but I definitely don’t think I am KDEnlives savior 
Happy New Year everyone!