For me, fitness experts and sleep experts are on the same level.

They are on the same level, but they are making opposite recommendations. Sleepists want morning daylight; fitness and recreation wants afternoon daylight.

Kids don't work out in the early morning before school. They engage in extra curricular activities in the only time slot available to them: after school. Taking daylight from the only time slot they have for themselves pushes them indoors, rather than being outside and active.

The reality is that the morning daylight that sleep experts want is easily produced artificially. Daylight lamps in our bedrooms can easily address the circadian issues the Sleepists raise.

Afternoon daylight cannot be similarly simulated.

TL;DR: Standard Time makes you look fat.

I'm a "children in a box" expert, which doesn't sound too good until I mention I'm a school bus driver.