I agree OP and from my own experience and from reading this thread it would seem that if you go to bed later and get up later then you are assumed to be less productive than than someone who gets up early and goes to bed early.
It's definitely not the case with me, I don't really have a sleep pattern as such, unless dictated by work, but that's always been shifts so not a 'normal' sleep pattern even then.
If I'm late shifts then I'm not home until 11-midnight, have things to sort, eat, wind down and I'm usually still wide awake for 2/3 hours so I get stuff done, quiet stuff obviously because although I live alone I have neighbours but I can iron, sort laundry, do home admin, online shopping etc and then I go to sleep around 3/3.30 and get up around 10.30/11am. I'm still getting 8 hours of sleep, do 'noisy' stuff when I get up before I go back to work.
If I'm earlies I'm up at 6.30 and do the essentials, then home by 5/6 and do everything then, and I'm normally back in bed by 10/10.30.
Amount of sleep is the same, stuff that gets done is the same, but somehow I'm considered a lazy slob if I'm in bed till 10.30/11am and far more virtuous if I'm up at 6.30 - if I did that after a late I'd be surviving on 3-4 hours sleep.
Nothing virtuous about that, and people tend to totally ignore that when they're in bed by 10 or earlier I'm still at work, or traveling home from work.
Sometimes I have to because I'm late onto early and I think because of the years of doing it I cope with it, but end up with a sleep 'debt', but it's something you have to manage with shifts. You catch up when you can, and if I've got a few hours in the afternoon on my day off to catch up, then lazy slob again.
It's a good job we have a mix of people in society that can function in both ways because some things can't just stop overnight and things need to be done during the day. Neither has more value than the other in reality, only in people's perception. Some people are just so wedded to their perception that anything else is wrong.
You can be just as unproductive being an early bird as being a night owl and vice versa.