The problem with ZoS (and Bethesda too) is that they have traditionally designed their games with the intent that players would do the heavy work in improving their game via addons. Especially so when it comes down to the UI which seems to be their weakest area of development. This is/was no doubt a cost-saving tactic to cheaper development cycles for their games, but also allowed both studios to focus on the concepts without burdening themselves with the important details.

This tactic may have worked well for the first successful single-player titles, but I do not think this approach should be the norm in multiplayer, online service games such as Elder Scrolls Online. Addons do incur a certain amount of performance cost on the client side, so providing a solid base-game experience would be preferrable to addon band-aids created by volunteers who may or may not be funded properly. There's no guarantees for addons. That's just how I see it.