As I have argued before, I don’t think there is any point in worrying about how teaching “compares” to other professions in terms of work-load and pay. We don’t do that with anything else. If we have a surplus of qualified, capable teachers, then that means teachers are overpaid. If we have a shortage of qualified, capable teachers, then teachers are underpaid. There’s no point in trying to come up with some platonic ideal of what teachers “should” be paid based on the work load. This logic suggests that teachers in some areas and fields are overpaid, and in others are underpaid. I am pretty comfortable with that conclusion.
The “clock-hours” think grows out of a vicious cycle between the teacher’s organizations and the school districts, both of whom want to describe teachers as hourly employees when it suits their rhetoric and both of whom want to describe teachers as professionals when it suits their rhetoric.
So my district wants to call me an hourly employee and argue they can assign me duties for every minute of every hour, and make me thumb in and out on a biometric clock, and refuse any flexibility about that for anyone for any reason, but want to treat us as professionals when it come to taking responsibility for getting our work done on time, whatever that takes, or attending training or after-school meetings, or whatever. So if someone wants to come into work 10 minutes after our start time–even though that’s still 30 minutes before school starts–because they have a kid to drop off, or they want to regularly leave right at the end of the school day, instead of waiting the 15 minutes before our official day ends, in order to make a grad school class–that’s not acceptable because we are hourly. But even if there is no time for planning built into the beginning of the school year, they still expect you to start with a room that is polished and lesson plans done, because hey, you are a professional.
At the same time, the teacher’s organizations/unions go the opposite way: if a school is requiring teachers come up on Saturday to scrape gum off desks (true story!), the organizations are all “You can’t do that! It’s not a contract hour!”. But when teachers are being micro-managed, it’s “Wait! Teachers are professionals! You have to treat them as such!”
Basically, both sides have a vested interest in switching descriptions as needed, and so both will continue, and the profession has developed a sort of schizoid tick because of it. People don’t even notice it anymore, we just all switch all the time.