@FabulousIAm
How is anyone having their dinner at 7pm unless it's the weekend and you're out for a meal without the kids? You're in bed a couple or a few hours later, surely? Is everyone having mental meals, or what? Breakfast window is around 7am - 9am, then it's a snack at 11am, then lunch at around 1pm, then snack at 3pm, then dinner at 5pm, then, if you're still hungry, supper about an hour or so before you go to bed. If you're having your dinner at 7pm or later, what time are you all going to bed?!
We eat our dinner some time after 7.30pm every day,
@FabulousIAm - as I said earlier, we got into the habit because dh's working hours were not regular - he was often not home until after 6.30pm, which was too late for the boys to eat, when they were younger, so they ate at around 5pm, and dh and I ate later.
We tend to go to bed around midnight - and our day's meals are somewhat different to yours - I tend not to eat breakfast (I used to be on an antidepressant that I had to take in the morning, which made me queasy, so I didn't eat until lunchtime), then we have lunch around 1-2pm, maybe a snack mid to late afternoon, then dinner around 8pm. We don't usually have supper, though dh sometimes has some cheese and biscuits, later on.
One thing that I found was beneficial about eating separately from the dc was that dh and I could have things they wouldn't enjoy - stronger tasting, spicier food, for example. Plus, waiting until after the dc were in bed meant we could eat in front of the TV, without setting a Bad Example!
The dc's dinner was still a social experience - I would stay and talk with them, and if we had friends over, and their dc were having dinner at ours, all of us mums would stay while the dc ate.
We did do meals together as a family - and obviously, as the boys got older, and their bedtimes got later - and as dh's hours became more predictable - we morphed into eating dinner together, and we still do, when they are at home. I think we were lucky that our boys grew up before smartphones became so ubiquitous, and we did insist that they ate their dinner at the dining table, instead of in front of the TV, so they had to talk over dinner, because the alternative was eating in bored silence.
The bottom line, though, is that people should do what works for them. Having dinner at 5pm didn't (and doesn't) work for me or dh, so we eat later. If eating earlier suits you better - that's great. It does mean that the cooking and clearing up are all done and dusted before the dc go to bed, so the evening is clear.