Yep, that sounds about right. I've found two of every piece of Marauders for my DH (except for the shoulders and pants) and I have yet to find Nat's helm or weapon, even once. Kadala will give me every legendary helm except for nat's... but such is life.
I think most of us have at least one item that we're still chasing, but that's as it should be.
Wizard unlike other classes have a lot of good builds. But I WANT this one specific build so I can play the way I enjoy playing. I was fire and had 120% fire damage (weapon, bracers, neck, hands, chest, source) but I got bored. Playing is about fun and to have fun I would rather go couple of torment levels down than farm T6 with no fun.
I completely understand. I ended up maining DH due largely to RNG. If I had been luckier on my Wiz, i very well could have had 3 level 70 Wizards instead of DH.
In order to get the gear to change the build you have to play that class. Since you don't have the gear to make the build you are left using a build that is less fun, making you not want to use that class. Since you're not using that class you'll (probably) never find the gear and suddenly you have 3 demon hunters and a ton more DH gear in your stash because RNG said "here, you are lucky on this char, why play anything else?"
Some day I will end up playing my other chars more to get them geared, I just have no idea when, as they all feel extremely under-powered now.