I think the pace depends on the personnel. If you have players who are great in the half court offense like Embiid or Doncic or Jokic then why push the pace? If you have a superstar who you want to play as many minutes as possible then you can't have him sprinting up and down the floor.
Last year the Cavs were highly dependent on Mitchell and Garland. Okoro, Mobley, and Allen could not create offense. Neither could Wade, Cedi, Stevens, or anybody else.
Teams that run at every opportunity need a deep bench. We had nobody behind Garland and Mitchell that could generate offense so JBB decided to slow the game down, reduce the possessions, and allow Garland and Mitchell to be on the floor as much as possible.
This year we have the guys on the bench who can put the ball in the bucket so we can run more. Jerome is an upgrade over Neto and Rubio, who missed half the season, and if Strus starts LeVert will come off the bench. With Jerome, LeVert, and Niang coming off the bench we should be able to score even if both Garland and Mitchell are resting.