The Champions League, or any knockout tournament football, is a crapshoot. So much of it is about getting in a run of form, and luck. Don't act like we didn't come up against what was the best attacking trio in modern football history in 2015, or a very good Madrid (where injuries and deflected goals played a big role), either.
You clearly do not understand tournament football if you think it's some linear progression. Also, very, very often the best overall team does not win.
Nobody is resting on their laurels, some of us just aren't sitting around bitching and moaning constantly, always playing the 'grass is greener' game.
Winning an historic 6 Scudetti in a row (and 3 Coppa Italias in a row), coming off of what were arguably the two worst seasons in Juventus' history is an absolutely MASSIVE ACCOMPLISHMENT. I don't give a flying fuck if that's not enough for you or other spoiled fans, it is objectively EXCELLENT. It is HISTORIC.
The team has obviously been trying to win the Champions League the past couple of years, if you think otherwise than you're not paying attention. Right now, we have a shit ton of injuries if you haven't noticed, and are slightly imbalanced relative to the formations Max would like to play, so we need to focus on defensive solidity. They will make some adjustments to create more balance in the summer. Also, we're second in the league in goals scored with a game in hand, and tied for first for goals conceded. It's not like all Juve does is play defense, but it's hard to go full out attack when half your team is injured.