The 2017 - 2018 NBA conference finals have had several blowouts where by the start of the 4th quarter one team is clearly going to win; yet stars are playing many of these garbage minutes. To put an example just right now the Warriors are winning by 25, 8 minutes left, in the 3rd game of the Western Conference finals. However; Curry, Thompson, Harden, ... were all playing. Same for LeBron James in some losses against Boston. They eventually go to the bench, but much later than I would expect.
Why not bench them earlier? In the playoffs you want your stars rested and not stat-padding.