Build options all classes?

When you look around guides and such, all you see is fully geared Mythic unique characters.

Are the game at this point only useful if you were sets, unigue, mythic uniques. Just looking at those you give up before you even try. I cant bother trying to find all these items just to make i build work.

My question is can you not do some torment level stuff, self found and without all these specific item? When i look around the game seems very narrowed to specific builds, is that really the case?.

I try make a minion necromancer, but its kinds hard since I cant find a single minion aspect, and some of those like more minions are moved to specific items.

You can play as you like but if you wanna be the strongest your char can be follow a build.

And that means uniques and mythics. But they so easy to get that its no problem.