Video NLE on Linux or, more preciseley, in the FOSS department, is lacking. In recent years there are some tools that have become feasible - Pitivi comes to mind - but Video Editing has always been a high-end specialised market. Anybody doing video editing professionally has a full-time job already and no time to programm software on the side.
On top of that, there has been a huge consolidation in the Video NLE market, with vendors and products dropping left, right and center or simply entrenching themselves in their established niche of mostly gouvernment or conglomerate funded media - such as Avid or Media 100.
The climax of this development was Apple sewerely screwing up final cut pro as they switched to App Store versions only. Lots of much needed pro features broke or disappeared without a trace and the people moved to Adobe Premiere Pro in droves.
Then again, that premiere pro and final cut where the last big players in the field shows that there's been quite some cleaning out.
With 3D it's a little different in FOSS, because we have Blender. But let's not forget that Blender is a very fortunate exception. It has a little built-in NLE and a very neat compositor, but still is mainly a 3D toolkit. It used to be a commercial tool and we managed to buy it free for 100 000€, keeping the lead developer at the same time (Ton Roosendaal). Despite being in active development, Blender still has tough competition in the professional field, although they've been feeling the heat from Blender free offering vs. their 900$ - 6000$ range of products.
What we need in video is a programm like Fusion or Shake going full FOSS and the lead developers staying with the product, funded by a foundation or something. Or a crew like Pitivi actually getting through and sustaining with their crowd-funding model and adding in all the pro features people want.
Personally, I'm going to look into Pitivi this year to see if it holds up on simple to mid-range video tasks. They appear to be very ... avid (no pun intended) and active. Maybe it's even matured further. But I don't expect miracles. If you want to do non-trivial video work today, you need tools like Fusion, Avid and the likes - and those are all closed-source.