I sometimes use Kino for dumping footage from my miniDV camera, its controls are pretty nice. However, I find its UI unintuitive and definitely not useful for my way of working with video, as I've described in this article. To each his own, I'm happy to have the choices. :)
Btw, you wrote:
"In Kdenlive/Openshot, importing the fragments is very slow and then you have to assemble them manually by dragging them to the tracks which is very slow and error prone if you have 50 fragments of 10s. Then doing a cut is very slow for no reason."
I find neither condition to be true here. Clips load very quickly and I have no problems aligning them on the timeline. Ditto for cuts, they operate quickly and accurately here.