Yes, unfortunately there are serious reasons to use the AppImage. For a good three months now, Kdenlive, as you can install it from Manjaro, has been buggy. The AppImage is the best that Kdelive has to offer. Unfortunately, it lacks the audio tools that are available as plugins. flatpak is also good, but the current version still has a bug, but it has all these plugins.
Fantastic, you can start this sqashfs-root directly!!! Just have to check if the copied filters are accepted.