Which language futures make D overcompicated?

[Suliman via Digitalmars-d]

I like D, but sometimes it's look like for me too complicated. Go 
have a lot of fans even it not simple, but primitive. But some D 
futures make it very hard to learning.

Small list by me:
1. mixins
2. inout
3. too many attributes like: @safe @system @nogc etc
Which language futures by your opinion make D harder?