I would like a Custom UI interface (if the default doesn't support it) such that I can move all my chat boxes and logs to another window/screen. Then I would like to move my menus to another screen as well. That way I can keep my screen completely free of anything that gets between my eyes and the environment that I am running through.

I come to SE for its beautiful visuals and music. I'm not going to let anything get in my way.

I would also like a 'custom UI' for interacting with my Retainers/Inventory/etc. if the default one does not let me manage it in a way that I feel comfortable managing it.

I do not care about constantly seeing damage meters. I use a parser if I want to understand how a stat/skill works. But once I learned, the rest is immaterial.

I do hope the community does not become such that they 'require' you to use a specific Custom UI or won't want to play with you. For example, if they say: You must use the stat-o-meters because we talk about % numbers for everything.