As a tank I raid with basic ui and tend not to use boss mods I find the constant spam of random things warning about a debut I'm already watching etc. really tedious. Some fights it's nice for timers but apart from that it really isn't needed. I wouldn't say it makes it less fun with them on each to their own but I'd rather have a player use it and not have to be told constantly what to do than them completing sucking because they don't know abilities of a boss etc.