You may not go for another playthrough just to get certain items and there is no guarantee that you will get them.
That's the beauty of the random system though. On one playthrough, I got tons of loremaster stuff, so I never had to sink more than 1 point into loremaster.
On the next playthrough, I didn't see a loremaster item until lvl 12. I had to sink points into loremaster and had to adapt my ability setup with the change.
You don't need a set of legendary items to beat game.
I don't want loot to become an itinerary list of "OK, i'm level 6 now, time to go to [location x] now to get my [level 6 sword of awesomeness]."
