Strange how 'experts' still say you can train a child to go to sleep earlier or later.
Didn't work for me as a baby, I didn't sleep until stupid o'clock then, and still don't now. My mother said I was the first of her five who 'never slept' and, as she was a full on 4 hours between feeds, leave them in the pram outside type of person, do everything to a strict schedule, for her to admit it didn't work must have meant it has always been just pure luck. I don't suppose she enjoyed it much either, as she was a 5.30am riser from the previous four, all of whom were asleep by 6pm throughout infant school.
DD1 would sleep from 9pm ish (if not later) when she eventually started sleeping for more than 45 minutes a time at age 4 but if you breathed too heavy from the next room between two closed doors, her eyes would snap open and she'd be up all day. DD2 had an afternoon nap between 1.30 and 2.30 until she was 3, but never, ever went to sleep before 9 and would happily sleep through until 8. Had she gone to sleep by 6, she'd have been living at her childminder's, anyway.
DP never slept early, either.
What baffled me was the woman I knew who complained about her kids being up by five every morning, put them to bed before 6pm - but then admitted that she woke up naturally at 5 and deliberately got them up from deep sleep because she 'was lonely without them'. Those children were horrible, whiny, fighting constantly - but when I ended with two of them on an emergency sleepover, they slept all the way from 10pm through to 9am each day, even with all the distraction of being with their friends (the DDs).
A kid that sleeps to the schedule their parent wants is just fortunate in having the same tendencies as their parent, in my opinion. No point shaming anybody either way.