Maybe try using generalization a bit less. It's all that matters to YOU. We've reached the point where many ppl have their bis legendaries for their mainspec and are looking to use their other specs(just as they have concordance and put ap in other weapons). It's your decision if you dont want more than 2 legendaries per spec. It's still not fair when class a needs less time to spend the time grinding the AP for 2 weapons and getting the optimal gear for 2 specs, than a druid needs for optimal gear for 2!specs.
Yeah, I do farm the shit out of them(though mb not as hard), I'm at 1 every 2 weeks roughly(at least for the last few weeks), which still puts me at 9 on my main :P and nowhere near 18 on a single class - but that's just fine I guess, as I might get a few after tos arrived, so I dont have to upgrade them.
The difference is how long it takes, which is much longer until you get those 2 for hybrids than pures if you have 10 for your main spec and want to switch to another spec(on average, obviously you could get them as your first ones regardless of class, it's just less likely as a hybrid). Also very few specs only need 2 legendaries. Just because you don't always equip, say, the Feral bracers, doesn't mean you don't also need them.
If you "expect" to play all 4 specs at a decent level in M+ and Mythic raiding I assume you have Concordance in at least 3 of 4 specs by now and close to 15 legendaries combined. That's the kind of effort you'd need to put in to be ready for ToS on 3 nevermind 4 specs, and with that amount of time invested you'll also most likely be capped on legendaries in at least one if not two specs.
I only have 11 legendaries with concordance in 2 dps weapons, 50 in resto and 43 points in tank, some people have better luck than others, some people got shafted hard before they altered drop rates.
point is, the "effort you'd need to put in to be ready for ToS on 3[...] specs" is higher on a druid than say a warrior
Are you implying that the supposed "legendary" which grants 30% damage on targets above 90% should be called legendary...?
It's not even on-par with epics that give 10% autoattack or 5% extra resource.