I disagree that this is good or sufficient. The total minutes played by my listed starter will depend on his stamina level, skills related to the backup, and score of the game. In other words, 3 things out of my control in that specific moment. If I want to have roughly 50% split between my starter and sub then the only option is to blow out my opponent. Which depends on the skill level of my opponent and available players.
OK
In basketball games, when the scores are close, the playing time for the starters is usually longer because the coach wants the most experienced and skilled players on the court to help secure the victory for the team.
Generally, the playing time for starters ranges from about 30 to 40 minutes in a 48-minute game.
It is rare for the playing time of starters and bench players to be nearly equal.
If you say this is a special strategy aimed at preserving players' stamina for more important games, then I can accept it.