This seems to always come up when people are complaining about public sector workers (I think they specifically mean civil service and local government officers). What is it about flexi time that’s so heinous?
Disclosure: I worked the first half of my career in private sector and am now the second half in public and have been mostly salaried with flexi time for 30 odd years. Am completely fine with it.
Sure, sure, some managers aren’t good at making it work properly, it’s not appropriate for a lot of jobs and some workers take the piss. But these issues are the same, in my experience, whether in private and public sectors and in both flexi time and fixed hours workplaces.
What is it about flexi time that it’s overall an unfair practice?
You are being unreasonable, flexi time is obviously unreasonable and you should cut it out.
You are reasonable, flexi time is perfectly normal in a wide range of jobs and not specifically problematic.