I just delegate my minor league systems to the minor league managers/AI and it honestly doesn't really seem to hurt. I'm about 6 years into my current save, and almost all my best players were international FA, who the AI managed not to mess up. Generally, I wait until they are in AAA with at least 2.5 stars before I promote anyone to the big leagues. That is typically around ages 21-23. The AI seems to promote them fairly appropriately for their skill, as far as I can tell. The best one I had was ready to promote at age 20, which seems about right...
It feels to me like there is diminishing returns for the effort you put into micromanaging prospects. I mean, even if you do everything perfectly, they can still get smacked with a random talent change, or just fade over time.
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