Some leagues guarantee equal playing time. It doesn’t end up being totally equal, of course, but at least every position player starts in half the games. These usually are newer or lower level leagues that feature a majority of D3 & D2 players…
The coaches are still playing to win though. Worst hitters hit at the bottom of the order and might get pinch hit for late in games. Best players still might DH on their “days off” or pinch hit/pinch run late in games