[coffexx]

It’s just the socially accepted pseudo standard. Shorthand to avoid complexity.

Where I’m at 10am to 4pm are the core hours and the rest is flexible. Overtime can be recouped in half days or full days off if you’ve organised appropriately with the team.

My suspicion is that it’s simply easier to make disgruntled noises generally about 9-5 than actually negotiating seriously at the smaller end of the scale on behalf of you or your team.