Being unable to do Outerworld did make me focus a lot more on the Tower, which has been very useful. I had sort of forgotten about it.
This has been on my mind lately, as I also tend to forget to make use of the tower, thus I've been brainstorming how to bring it into the Outerworld. The main issue is that the tower has an independent progression, so if you are at world level 100, you may still be at tower floor 5, or vice versa. So I might make it available in the Outerworld but without any permanent losses to your party (which is how it works already).
The other option is to just have it flash at certain times in Sanctum; maybe if your current party is around the level of progression where there is a chance to beat that tower floor.
Was the easy character-related trivia intentional? It has made me learn what each character's motto is.
Unintentional, I originally had the riddle trivia without any names showing for each option, but I wasn't sure if the icons were obvious enough, thus I decided to add the names in for those, however this unintentionally resulted in showing info during character motto trivia also.