I couldn't really find a place to put this, and I did a search and the most recent post was in like 2018, so I thought I would post something.
Now that there is more of a focus on fleshing out the older content, I think it would be interesting to finally expand on the thieves guild and possibly also the dark brotherhood. From what I can see ( I could be wrong, I know I haven't done everything yet ) the thieves guild content seems to be overwhelmingly focused on the vanilla zones. That and the heists are quite limited in number. Imo it would be interesting to freshen up the thieves guild / dark brotherhood by adding dailies, and even new story lines, in the newer zones. We have quite a few daedric planes now, so the possibilities are really quite endless. While the usual quests in newer zones would be appreciated, I think there is quite a bit of room to get a bit more creative with the quests, it doesn't necessarily have to be the same old formula.
Anyway, just thought of this since coming back and making a thief / assassin, and was just having some late night musings in my head.
Don't get me wrong, the thieves guild and db are good how they are, but they really could be exceptional and a nice change of pace if a bit of love was put into them after all these years.
What do you think?