the problem here is not only thonderlords, but the tree system.
I more often than not just take thunderlords because i want the hybrid-pen or the extra cdr, which i both homestly value much higher than the %game due to the early focus of the game.
So if i go deep into the resolve tree, Thunderlord is the obvious choice for most, as few synergies with windspeakers and stormraiders just needs some changes
If i had the choice, i would often fo with deathfre or fevor instead, but they are mostly of similar power, which theoretically is good, but that means that is see no reason to get them while missing out on the oen or cdr.
At the same time, i always get grasp of the undying despite most of the time prefering the cdr or pen in any melee laner and most tanks in the jungle, just because Grasp seems so much stronger to me that it's worth to get it despite haveing to pick not optimal stats.
The 'trees-system' just inhibits flexibillity and thus real customisation of the masteries...
Also, if you don't go for crit, don't have ways to keep dft up and are not that much AA.afine, what else would you take if you want an agressive masterie?
There are alot of champs for which it is the only real choice since, atleast once fervor and dft are nerfed.
though i'm not opposed to the per target cd, once had a game vs douple thunderlords bot+on the jungler, prettymuch died to the trippleproc+ignite alone