One thing I’ve run into that has become annoying is that I’ve been wanting to merge out collections that are franchises that span both TV and movies. A good example for this could be, say I want to make a “Marvel Cinematic Universe” Collection that compiles all the Avenger + Marvel movies together into one collection – but also want to include any MCU TV shows such as Agents of Shield and WandaVision.
That I can tell, today this isn’t possible since I’d have to have the movies in one library and TV shows in the other.