But how will the boss know you're working if the only evidence is that all the work is getting done?

For salaried jobs, sure. But the likes of ford would be looking at hourly workers. Where your job involves working with other people. Such environments always needed working hours. But nowadays, few have anything close to 9-5. Even retail tends not to be any more.

But more importantly. Moving away from hour in any lower paid job. Is just creating more opportunity for corporations to rip staff off. It is already way to common for corps to find ways to not pay for the odd bits of time worked.

hard agree on the siesta idea but instead of 12-3 I'd say stop work at 3-6 instead, or work mornings and evenings (with lots of time in between)

in summer, the hottest part of the day can be 4-6pm (because there's a big lag between the sunniest part of the day and the ground heating up, which then heats the air) - also Spain has a weird timezone (GMT+2 despite being west of us, so their sunrise was 5 mins earlier than ours, but was at 7am local time, and ours was at 5:05am)

Sounds like someone needs a daily motivational 6am team meeting.

How does it work for parents with kids at school? I guess the schools would have to start just as early.