I don't like this simple fix.
If garbage time is turned off for the "follow depth chart" subbing strategy,
the starters would stay on longer instead of being subbed out in garbage time,
which makes the playing time feel more monotonous, with less variation, and in turn affects the management of players' minutes.
Right now, managers also have other more viable 48+ strategies.
Moreover, the manual says "You can use mostly your judgment (Follow Depth Chart)," which means coaches still use their own judgment in certain situations.
I'd rather hope for what BB-Justin mentioned in
(324599.6):
maybe the new BB ownership can improve the substitution logic when they rebuild the game engine.