While 11am seems extreme I think having the start like 9 or so might be better, but, then again we have the coordination of getting kids to school and you to work in the same time frame then.
The only benefit you might see from forcing those young adults to get up before they are ready to wake up during their school years is that you might condition them to see their hours of morning grogginess as normal and reduce the psychological distress they might otherwise feel when considering the prospect of going through that experience every work day for year after year with no prospect of relief.
Also, conditioning yourself to wake up at a certain time... your body doesn't work that way.
Fast forward and these days, since setting up my own company, I rarely start properly working until 11am. By that time I'm not exhausted getting up and am ready to be immediately productive.
So what about adjusting to societies (stupid) rules at such an early age - most people are not morning people anyway. School is supposed to be about learning and productivity, so why are we making it part of the "hours just for the sake of it / that's how it's always been done" problem?
School hours are basically currently set as it's a form of childcare but parents are working all kinds of hours these days - why should schools be different?