About Germany and Steam

If they are ROW with no exceptions I don't see why not, but don't quote me on this. I am really not sure

Yes and no, it depends on the publisher.
Some just block buying the game with a German IP others also block people activating those games if you have a German IP, so you would need to use A VPN what is against the Steam ToS and could you get banned.
A good German group where you can look stuff like this up is this http://steamcommunity.com/groups/foruncut

Edit:
Dying Light: http://steamcommunity.com/groups/foruncut#announcements/detail/222134794910506937
Mortal Kombat X: http://steamcommunity.com/groups/foruncut#announcements/detail/190617144672542652

that witch hunter 3 though :X reported

i like books

I'm having the same problem.

According to my google results, there's just very few uncut/indexed games that don't activate in Germany.
Steam just isn't allowed to sell them here. Yet you can activate them. Already done it myself.

Just be careful that you don't get them from Russia (and USA), as they might be region locked (which is a different story).
Gifts from Austria are fine for example. Try to stick to €urope and you won't get into trouble, because steam doesn't really care for our laws, but whether we pay the "full price" or not.