I worked at a company where I turned up late for work, left super early. Did some work in the evening, worked from home when I felt like it. Want to talk employee engagement, its the happiest Ive ever been working, and Id put a lot more effort in just to have that flexibility. I worked a lot more productively this way, and also it fitted well with eg senior people that work 10 hours a day or whatever, as Id respond "out of hours". Forcing 9-5 attendance on people who can be more productive working to their own schedule just seems stupid.