I've heard a couple rumors/theories before that some people thought stamina drops were correlated to player minutes, so if you believe that, "resting players" would in a sense save them from an extra stamina drop every 2-3 seasons maybe, but I don't think there is any impact big enough to warrant "resting" your starters when you need them.
50-70 minutes for GS is the only reason to rest players so that they can get optimal minutes in my eyes.
Murray/Harris/MPJ/Grant/Jokic - 2020 NBA Champs