People who espouse remote work seem convinced that it’s the end-all way to work. I don’t care if I have to go into an office. I like offices. What I care about is that you don’t mind if I work from home every once in a while. I care that it’s okay for me to leave early or come late.
My opinion as an employer: Sure, feel free to take your work hours as you like and WFH every once in a while. Just make sure that overall your total hours are what we agreed to in the employment contract.
Imho flexible hours are a good thing as they remove the pressure to stay around doing nothing until late because you can't be seen leaving before 7pm.