I have to take issue with this statement. The LFR is a wonderful tool to learn the basics of the fight. Yes, it takes out most if not all the mechanics, but if you are prepping for normal mode (at least in my case) its better than watching a youtube video of some else’s strat. Yes, there are all different types of people that play this game some better than others, some actually take the time to help others make it through the LFR, if for nothing else then to at least make it through the content with some of your sanity intact. Just making a blanket statement as you chose to make, really does the whole LFR concept an injustice. Not everyone that goes in there is mentally challenged or a first time raider.
Some like me, which do not have the time or the patience anymore for progression raiding (I got tired of the blaming, yelling, screwing around, whining about I should have gotten that piece gear crap) every Tuesday and Thursday night. The best raiding guild I was a part of was way back Wrath, it was a solid group until the guild leader and raid leader stop playing because actual life took more of a priority. It has been a very unrewarding experience to say the least for me since cata. I like to see the content; gear is second to me, though I do like having it for transmog purposes. The LFR also gives me a chance to know the fights to some degree, in case a friend asks me to fill in on a raid. This way they have to explain very little, if at all about the fight to me.
A lot of people slam on the LFR, some with good reason. I hate when people feel the need to be a jerk and pull endless amounts of trash, just because someone hurt their feelings. I am sure flex raiding is also a wonderful experience as well, as long as someone prepares themselves before going in the group. Not everyone a medium to hardcore raider. At best most play a couple days a week. I guess I have more patience then most, because you have to have patience when you are raiding or even pvping. My suggestion is take heed when making blanket statements as you chose to make here. Have a nice day