It would be nice, yes. And while we're sorting it all out, they should also get lunchbreaks and coffee breaks and not have to do playground duties or sit with children who are being kept in for 5 minutes because they are naughty, or help those who've come to them during lunchbreaks, or run lunchtime clubs or after school clubs.
And they should be able to choose their holidays so that they are not always confined to the most expensive parts of the year.
OP - most teachers do in fact end up with a similar amount of holiday time as the rest of the world, it just doesn't show up on paper.
Going in at 8.00 gives you time to set up the classroom just before the kids arrive,including getting all the equipment ready for a series of activities through the day. Let's say kids go at 3.30, 1.5 hours is nowhere near enough time to write all the observations or reports of the kids you might need to do, marking work, tidy the classroom, do planning, prepare (eg print and laminate) resources etc. And then you have to factor in after weekly school clubs, regular staff meetings, meetings that you didn't foresee (maybe with a special needs co-ordinator if you have a child in your class needing help), time to put up displays around the school (only occasionally but still needs to be thought about), time to organise school trips (including booking the trip, booking the coach, doing all the risk assessments), and what about keeping up with developments in your field and the professional development angle (by which I mean reading the appropriate articles and reports, not the formal day long training sessions)?
Coming from a family of (primary school) teachers, the pattern is more being in school 8-5, but bringing home work every night, usually marking and planning, and working for 2 or 3 hours most evenings, plus one half day at weekends, plus going in during most holidays (2 weeks during the summer holidays is normal, for example, when you need to strip out everything from your old class and redo the whole room, new displays, do new name labels for everything, etc etc). And if you take on an after school club like my sister has, she also has planning for that to do.
My family wouldn't change what they do for the world - it's a vocation and they love the kids and the challenges, but it doesn't make it an easy ride with lots of holidays.