3 summers ago I was sure we needed a central midfielder and left back - we didn't sign either, Klopp played Milner at LB and converted Lallana and Wijnaldum into CM's and we made top 4. Two summers ago I was sure that we needed a CB and a CM - we couldn't get VVD or Keita so Klopp waited, we made the top 4 again and the CL final. 12 months ago I was sure we were a forward light to really challenge for the biggest honours - we won the CL and picked up 97 points.
I still think we're an attacker short of being able to match City in terms of depth but I've learned to trust Klopp and co to make the right decisions. I'm sure they too would have wanted another player or two but they won't settle for 2nd rate players, they had to be the right players and the fact that we've not made a meaningful signing is because the players we want aren't available.