You can't 'learn concepts by repetition', that is not how learning works. You can learn a concept & repeat its application to be faster at it.
And that's the problem. What if the student didn't catch the concept during the lesson? He or She needs help by a guardian or be punished for not completing the task.
Same thing with the supposed self management skills. What if the student fails at it? He or she needs help by a guardian or will be punished.
At the end of the day homework is a tool to offload tasks of the school to the guardians of the student. A schools system, that relies on homework, is a system that fails in its task of creating a level playing regardless of socioeconomic background of the student.
What are you basing this statement on? All analysis I have seen so far come to the conclusion, that the war is devastating on an humanitarian and demographic scale, but sustainable for years to come from an pure manpower & training-capacity pov. (Given historical data)
The same analysts suggest that the main reason for the current stalemate is the lack of weapon systems/munitions, that would enable a sustained breakthrough like artillery, tanks and air defense systems. Stuff that western allies hesitate or are incapable to provide in large quantities.