Here is a list of things Excalibur can't do. I break them in two categories:
API limitation – this means, there is nothing in API that will allow to do this. Though, maybe I will be able to find workaround.
Premiere Pro bug – it's a bug, so hopefully, it will be fixed at some point by Adobe team.
Some of the commands won't be shown in Premiere Pro history stack, so it will be impossible to undo them.
Some of commands fill up history stack pretty fast with multiple actions.
To give yourself more control over it, increase History level (max allowed value 100). Open the History panel
Window > Historyand choose Settings from the Flyout (hamburger) menu.
Paste Clip command won't work with clips that were cut (not copied) in Premiere Pro 2019
Masks (e.g. in Opacity effect) are not supported.
When applying video preset with Lumetri Color, color wheels, curves, anything that has some kind of graphic interface, will be set to default
If preset has colour value with keyframes (e.g. Tint), colours at keyframes won't be correct.
Transition presets can't be applied
When applying preset, all non-linear keyframes will be set to linear