ESO is such a huge game that lets you do anything you want, from exploring any zone, to various guild questlines, DLC questlines, Main, Alliance, Zone questlines and small unique quests, to highly rewarding daily things like writs, pledges, quild dailies, battlegrounds and the list goes on and on. You can do anything. Or can you. I for one can't. Due to ridiculously low total allowed active quest limit i often find limited in my game or walled off of content entirely (Cyrodiil) because I can't pick a quest as I wander into a new zone and an NPC runs to me or stalks me screaming in my ear DO YOU KNOW HOW LONG I'VE BEE LOOKING FOR YOU?! (How could I not know?), and while I understand that an unlimited quest log might be too confusing, at least make a separate quest list for daily and repeatable writs, pledges, guilds, Cyrodiil, Battleground quests so that they don't clog main list, effectively stopping me from exploring. Or let's say I'm in the middle steps of some storyline/exploration quests as I log out, and want to quickly do writs before venturing into the unknown world the next day - nah can't do that unless I ditch 6 half-way done quests just to make room for those quick writs, not to mention other quick daily stuff. Why can't I pick up both kinds of quests and do them at my convenience?
tl;dr Please separate daily and repeatable quests from unique quests and questlines, so that the repeatables don't take the storyline/exploration quest slots. Adding more quest slots would be very nice too, but separating repeatables from unique quests would be more important imho.