In the case of elementary school, though, you are dealing with kids young enough that they probably cannot reliably be counted on the get ready and leave for school on their own, and so you need to fit school times in with their parent's work schedule.
I know live in a wealthy school district (with very good athletic programs) and high school starts at 9am.
In both places at least some of the athletic/band programs started before school.
Just an anecdote though, I never heard that rationale from an official source.
It's slightly different from no-DST in that "the sun is directly above" is no longer approximately noon, ever; the TZ is effectively 1 hour off of what is should be and DST is abolished. (The sun would be overhead at ~1pm year-round.)
(It would also mean that during winter, in some locales, the sun would not rise until after 9am. I personally like seeing the sun in the morning.)
As other have pointed out, starting school later (around 8:30-9 AM) would have students coming in after sunrise, but then school would go until ~3:30 PM and you run the risk of all students getting home after dark during December and January.
It's elementary school kids that it would make a big difference with. Under the current system here they are always going to school after sunrise. If we went to permanent DST, they would be going in the dark for about 2.5 months.
For example I see kids walking to school at around 7:15 AM (6th-8th grade and high school) and around 8:30 AM (K-5th grade).
This is at latitude ~47.7° N (same latitude as the city that is part of your name, in fact).
Here is what various DST options would do in terms of kids going to school before sunrise: