I was just thinking about some of the good stuff from Morrowind that's now disappeared from later Elder Scrolls games.
The one that I was thinking about was the ability to put a note on the map by double clicking on it. I'm pretty sure it is in vanilla Morrowind and I used to use it a lot, usually by putting comments against various locations or tombs etc. It saved time marking somewhere as having been explored or cleared or even warning about something that was too strong for my character at their current level.
Don't know why it got dropped from later games, I think it's really useful....