Studying takes too much time, and there is only a limited number of hours. Spaced repetition method uses time intervals and makes you recall more information, using less time.

The spacing effect maximizes learning and your study becomes more efficient and consumes less time.

• Role mismatch.
• Too much/too narrow end-goal restriction. 
• Strict ration of resources, including insufficient time.
• Lack of group diversity produces less creative results.
• Discouragement. Too much criticism, endless evaluation...

Do not look for a perfect plan before jumping into writing code. 

Look for a good enough plan, something that you can use to get started. The truth is, your plan will change, but what it was good for is to force you into some structure that leads to more clarity in your cod...