Not every raider is like you. I don't have much to brag about, I was just the designated off-tank on add duty for Sartharion 3-Drakes pre-rush, designated off-tank on all the other Ulduar fights and designated main tank to control pre-nerf Mimiron positioning, etc...but I can't prove it to you. So you can rest assured that I'm just talking trash out of my mouth and I don't even know what a raid is. :3
I've been having fun doing Aurum Vale runs with first timers and I always suggest we just "go for it" on each boss. Then I drop a hint here and there after wipes, pointing out only the things they're doing wrong.
Obviously I give full strategies if they prefer that, but it seems people mostly prefer to experience it first-hand if you offer to do it with them.
And I get to experience the fights in whole new ways each time I do that. What's the fun in making everybody execute the same strategy over and over again? :3
At least for leveling dungeons, there's no point asking people to read up and learn the fights beforehand.