I only really agree with 1, but they already said they'd make the system smarter to detect specs in the future, but most likely not till MoP. I'm still fine waiting for it. The class lock outs at least bandaid fix most of the looting issues for wrong spec/class.

I won tier 13 shoulders, two pieces dropped. I needed on both, I won the second. If it had locked me out from rolling on the second, I wouldn't have tier 13 shoulders. I do not think it should ever lock someone out from rolling on both. It should however, roll them out as one piece and the top two rolls get it, or if you win the first one ignore the roll for the second.

RNG is random. If someone gets lucky, they get lucky. I went through all of bc without a any tier head piece, I never won the drop or it didn't drop. I laughed about it. I never cried, blizzard needs to give everyone else in my guild a diminished roll so i could have a head piece. In wotlk, it was booties. I could never win booties or they just wouldn't dorp for me. It's the way things go.

Now that aside, I might agree see diminished rolls if someone has an equal item level or higher in that slot. Most likely no bonus, or if they don't even get a bonus a dimished roll. The reality is, sometimes an item of lesser/equal item level is better than what someone is wearing. Now for the most part I don't think that situation would happen often in LFR at this point, but looking into the future, it could. Or perhaps someone has the valor shoulders and wants the tier shoulders for their 4 piece bonus. If you force them not to roll because they have an higher item level, well you are screwing him out of his 4 piece bonus. Is that fair?

Putting more restrictions in will hurt players worse or just as badly as bad RNG.