Yes, I understand that.
But what I and others are saying is that it would make more sense if TV shows were not removed from the Watchlist when one episode is watched.
If you’ve only watched half of a TV series, then you still “plan to watch” the other half, so it should still be on your Watchlist.
In a perfect world, shows would only be removed from the Watchlist when they are finished. Either Ended or Cancelled with 100% completion.
But as I’ve said, using a custom list in place of the Watchlist mostly works. It’s not perfect but it’s the best solution for now.