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I’m still adjusting to the new UI, but since I mostly use Trakt on iOS, it’s less of a shift than on web. However, there are some features that I’m missing, and some answers to your questions.
Notes - I write down who recommended a show/movie, so I can let them know when I’ve seen it. I’ll also make a note of sub vs dub for anime. Or just a general reminder of why I wanted to watch the content in the first place (i.e. the director, an actor, etc)
Listing seasons and episodes - this feature is really helpful for non-serialized shows. For example, I want to watch certain episodes of a cooking show because I like the competitors, so I would add the relevant episodes to a list. That way I don’t have to dig around for episode numbers later. I’m also assuming this would be helpful for anyone trying to make “Best Of” lists
Filtering by lists in Discover - the way I would look for new content is by going into the equivalent of Discover, pick a list (Anticipated, Recommended, etc). Then I l filter out everything that I’ve watched, is already on my watchlist, or is on any of my lists. You kept the first 2. But now that I can’t filter out anything listed, I can’t really use the Discover feature - I just see a bunch of items that aren’t new to me/relevant.
Manage Lists not being displayed prominently - I’m guessing this was removed because of the restrictions on number of lists for free members? Personally, I always put content into lists, not just the watchlist (or exclusively on personal lists and not the watchlist). So I have to go through extra steps every time. This isn’t a huge deal, just an annoyance that I figured might be a useful tidbit in how I interact with the UI.
Hiding Community Sentiment and Reviews - these are now featured so prominently, and I simple don’t care; I have the official reviews listed, so I don’t need to see random Trakt users ratings and opinions. I would love a way to hide these. They were less obtrusive in the last version.
Hopefully at least some of that context is helpful!