It might be an unpopular opinion, but once you are on $250k+ a year like most of the readers here, it is reasonable of the employer to demand both your butt in a seat and results.

I my personal experience the guy who turned up at 8am and started getting shit done, always was far more productive (and indeed ended up a much better coder very quickly) than the “judge me by results not hours” guy turning up at 9:45. Even despite the latter guy being smart and more experienced.