Trakt's lists are static. You can manually add or remove movies from a list, but that's it.
I think it would be GREAT if Trakt added functionality to create "dynamic lists" based on criteria set by the user.
For example, let's start with my master Watchlist as the source. I would love to create two additional "dynamic lists:"
1) Movies on my Watchlist that ARE on one of my preferred streaming services
2) Movies on my Watchlist that are NOT on one of my preferred streaming services
These dynamic lists can refresh every 6 hours (or maybe automatically any time the metadata for one of the movies is updated).
I realize that I can just go to my Watchlist, then filter by Streaming Service ("All Favorites"), but I use the lists to import into Radarr, so that doesn't help me at all.
I apologize, but I should have categorized this as "Lists-related Feature Requests." I can't figure out how to edit it.