Oh man, 3.8.99 is almost 6 years old! There are many thousands of hours of improvements: physics, sliders, the new transform constraint, fewer bugs. Oh nooo you don't have a graph in 3.8! The graph view, an improved curves view, the awesome favor tool, keying X/Y separately, sequences, direct PSD import (it's super fast!), 4K icons, duplicating constraints and their bones together, weight locking, mesh weld, folders for slots and constraints... I feel bad that you are missing SO MUCH. π Sorry if you're aware and it's out of your control. Maybe management could be convinced the magnitude of the improvements is worth it?
The 4.3 runtimes are more efficient and use less CPU, even though lots more features are provided. The upgrade would give benefits everywhere.
We are available to help your development teams upgrade to v4. They can reach us at: contact@esotericsoftware.com
I noticed in your video some misalignments in the UI, probably caused by using UI scale != 100 or 200. In 4.3 that shouldn't happen and all the text is crisp at any UI scale.
BTW, do you mind if we show off your rotation trick in our videos or tips? We'll credit you for the technique!