First of all, you can apply those kind of blanket statements to any WoW expansion and it would be just as valid.
Second, you're asking for factual information to prove something that is very subjective. Much like how you have provided your opinion and most likely would appreciate for people to respect it, it would serve well that you do the same for others opinions.
Have you guys ever considered that uh, PVP medallion is an uninteresting choice of equipment and that every race should have EMFH baseline ( as in, everyone has a CC breaking trinket built into their character ), and humans get something else?
You seemed to have ignored some of the finer underlying points which is fine, i'll highlight them a bit better
I wont argue the strength of Shaman vs Druid, they're both obviously exceptional healers.
And yes, I agree that training a healer is more less equally as viable ( or unviable depending where you stand ) regardless if you're a Resto Sham or RDruid granted you have the proper support. Any comp that can kill the rSham in rSham+Moonkin is probably as capable of slaying ele+Druid.
However, the main point here is how squishy Moonkins are, you can argue that they have superior healing and whatnot, but they are so much more susceptible to burst windows which is what is scary for attrition comps like LSD/2, that alone makes LSD more consistent for ladder and tournament play. I would also like to point out rShams are susceptible to hard swaps which leads me to my next point...
Yes, there are cons as well to having primary CC attached to your healer but step back and look at it this way. Ele+Rdruid is capable of far more lockdown and CC than Moonkin+Rsham. Since moonkins are so susceptible to dying - far more than an Rdruid -, they will have far less chances to push up and CC, ESPECIALLY when you're factoring in SoTF. The point here is that Rdruids will have way more opportunities to get effective clones than a moonkin, and it comes at very little risk for the rdruid and extremely high for a moonkin.
I dunno, I can go on and on about how much more effective Ele+rdru is but I feel like it should be obvious, playing against Blastabadar+Sodah is a nightmare in comparison to like, Maorimoron+Rsham of his choice simply due to comp, all extremely excellent and top notch players but the class disparity is significant.
The common theme here is really just Moonkin+Rsham comps come with more risk and a smaller margin for error than Ele+rdruid.