Mission level 11+. Yeah or Nay?

My personal opinion is I can't wait to get the game in a state where I have some degree of uncertainty towards our mission success.

We come to a point after 500h where the level 10 seem too trivial and we have to run sub-optimal load out and pick the worst stratagems to keep it interesting.

I don't think making the game more difficult is the way to go for a lot of people, but the ones I am playing with feel it's getting way too comfortable.