Eh, my "problem" is the fact this happened in older Hitman too. I'm doing Paris level again and again, and until now I discovered a lot of new info. Like, when you disguise yourself as model, there's a whole new plot line with the woman you need to kill.
When you disguise as bodyguard, it's the same. It's great, but nothing new, really. I think the game honestly is too much based on repetitions. On Absolution there were challenges too, but the game won't force you to complete them. There was only one achievement )if I remember correclty) asking to complete 100 of them, but the majority came by doing levels.
I think this Hitman is very poor on contents: when the game will be complete, we'll have something likesix main levels plus 2 training levels, it's a very small number compared to other Hitman, which comes usually with 12 missions minimum to get on 20+ in Hitman 2.
IO here just make visibile, rewarding you with achievements and a virtual checklist, a system already acting in all Hitman games. If you take out this checklist, it only remains a small amount of content in my opinion. I'm not saying the game is bad, it's great, even if I find it a bit too easy but I think people who played classic Hitman will agree with me, here.
But usually when I do a clean run with no save, suit only and Silent Assassin rank, that level is over for me. Yeah, I can replay it a couple of times for fun or discover new things, but I achieved my goal, to get the best rank possible.