I think Klopp already made notable adjustments in 2012, when Großkreutz lost his midfield spot and Sahin was brought in to replace Kehl/Bender in DM. 14/15 probably also taught him a lesson, when injuries took out most of his creative players and teams just bypassed all the (gegen-)pressing with hoofball.
When he started at Liverpool he already brought those experiences with him and you can see it somewhat clearly in certain decisions, e.g. the striker position: at Dortmund he used physically imposing no9s like Barrios or Lewandowski to lead the line and he was seriously considering signing Benteke for what would have been silly money, whereas at Liverpool he froze out the latter almost immediately and settled on Firmino relatively quickly. At Dortmund he seemed quite fine with having a goalkeeper in Weidenfeller and CBs in Subotic/Soktratis who had limited ability on the ball, at Liverpool he brought in Matip and spend two fortunes on VVD/Alisson.
Since last season already went very well for them I would assume that most of his deliberate adjustments over the summer were aimed at conserving energy, because that's the second weakness of being too reliant on pressing isn't it? It's fine to play games with the aim to outrun and outfight your opposition if you have one a week, but if you do so with the EL/CL or even CWC on top then you're burning out your player's minds and bodies in record time.