You’re literally in the classic forums complaining about people using add-ons my guy.
Add-ons aren’t some cheat code, they don’t play the game for you, all they do is relay information in an easier way to see the information.
You have never done a raid fight where 5+ mechanics are going off all at once, the extent of your pve experience is not standing in fire or not standing in a void zone later on in Naxx.
Add-ons aren’t playing the game for you, they don’t calculate all the mechanics coming into play and tell you where to stand so none of the mechanics hit you, they relay information telling you which mechanics are coming.