TBF I don't see that much improvement in Grealish, style of play and role on the pitch hasn't improved that much.. In terms of statistics I think he has similar to last season's..
He still passes back ball to Ake or Rodri whenever arrives to opponent's box, still dribbles whenever has chance to move forward, still keeps the ball and rarely looses. So these were his traits from the beginning, for example I remember games against Chelsea and Liverpool in 2021..
I guess what changed is, that due to 100m fans were waiting for Messi or Maradona and they somehow decided that he was a flop, so compared to "Messi expectations" - Jack seemed to be a flop, compared to "flop expectations" - Jack seems to be a OK or great player and that's what happens now, people have started to realize that he isn't that bad player and is a valuable member of this squad..
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As for the realistic ones, like me or other ones here, we are still waiting for Jack to fulfill his true potential and show what he is really capable of..
Problem is the final third obviously -> Just don't pass back, try and make an effort, shoot or go 1 vs 1 against fullbacks, cut inside, make some fucking actions and become a player who leads the attack, don't be a passive team player, be a leader who makes the difference.
I think that's what Pep Is asking from him now and hopefully we will see that.