A lot of people are starting or want to start a new character to experience the game / story on challenge difficulty which is great, great for the game, population, engagement, older areas abd support/motivation for new players that will meet a lot more older players during the early game.
Imo this is a win for everybody!
BUT
people dont want to have to delete a character they have played for yeeears to be able to have the same experience if they are already at full slots...
So it would be really nice and beneficial for the game if we got 1 more slot with the next update!