I'm all for Add-Ons, if you don't want them, then don't use them. It's mostly a vocal minority who doesn't like using Add-Ons.
Like, a lot of people say they don't like Recount, but even if they made a Recount-type Add-On, they'll still use it. I myself would also like a Recount Add-On as it'll help me see what I'm doing wrong in certain encounters that I'm having trouble with. Am I running out of Force to fast? Overhealing way too much? Etc.
I know, a lot of people also want Customizable UI's. I myself don't mind the UI, but even in General Chat you see people who dislike the UI all the time. So, these will show up, or Bioware will add an Option to allow you to customize your UI.
Boss Mods, now, I myself used these in WoW since I came from a competitive Raiding Guild, but WoW has evolved to the point where the game itself will tell you the stuff toO avoid, and when it will happen with the Dungeon Journal and Raid Shoutouts. So, again, the game could go either way.
Along with other Add-Ons similar to Atlasloot (which is great for planning), or other fun style Add-Ons.
So, I welcome Add-Ons if they come, and if you don't like them, simply don't use them.