I think you need to distinguish between classes of users, e.g. home consumers needing some basic editing features vs. a hollywood studio, and the spectrum in between.

I use KDENLive a lot and I find it to be an excellent product. Not perfect, but well thought out and powerful. Documentation I give a C grade too. It's awesome that some exists, but it tends to be outdated and frequently omits details about the specific thing needed. On Linux I do recommend using the App Image or Flatpak though as I have run into dependency issues (mainly codecs) when using system packages such as Fedora's.

For a typical user/consumer who just needs a video editor that can do more than just trivial cuts, I think it's an excellent option and it's the one I use and recommend to others. Unless you're looking to do advanced or highly complex products, it can do it all and in a fairly intuitive way. There are also youtube videos and such that demonstrate nearly everything you might need to do so there are plenty of available resources.