I think calling it a cop out is missing the point. It is one of the key elements of this game's design. It is intentional. Skill improvement of players is based on achieveing minutes played at a particular position. Weekly game performance is also tied to minutes played. This combination necessitates a managerial choice. That is the design. You are certainly entitled to disagree with how the game is designed, but I don't think the developers were copping out by these particular design choices. I think they were doing exactly what they designed.
What's more, I would argue that time spent = good manager. Roughly. Time spent doing anyting makes you better. Golfers don't get good by showing up at the driving range once a wek. Cellists don't get good by playing scales for ten minutes every other day. Guys in this game who make money on the TL spend a lot of time sussing it. People who are good at managing minutes spend a lot of time doing it, or have put in their time and now (like myself) don't really need to worry about it much because they have a good handle on how to get different types of players different amounts of minutes in different types of games.
If it truly is a waste of your time, you should revisit your priorities because our lives are too short to be wasting our time.
Once I scored a basket that still makes me laugh.