A low stamina player can get maybe 34-38 minutes on average per game, whereas a higher stamina player can average maybe 42-44 minutes. If this is one of your best players (starter) it is probably better for him to be in the game and effective for longer than one of your bench players (back-up).
So, there is a very negative attitude on our National Forum (Russia) to Stamina. Some believe it's ABSOLUTELY useless skill, some (a smaller part) think the other way. But both of them haven't got any arguments!
The question you have to ask yourself though is, is it worth playing your star player an extra 10 minutes when he only averages roughly 8 more points during those 10 minutes while your backup to the star player is averaging anywhere from 12 to 15 points a game during those extra 10 minutes that your star normally does not play?
It seems to me that if the game is set up to do substitution correctly whenever a player has a stamina issue their sub should be brought in. Since we have no control it must be automated for benefit to all players.In this case if your backup is close enough in quality to your starter than you shouldn't have to worry about stamina right?