This was my experience, too.
I think part of it was lack of visibility. Before the internet you didn't really know what other people did inside their own homes or how they raised their kids. And people to an extent didn't really question it.
If your parents had a good childhood, they probably did the same. If they had a bad childhood, they either did the same, or they tried to improve on it.
Personally, my mum had a bad childhood and she tried to improve on it. She was brought up in a home with a lot of alcohol and gambling.
Therefore she was very against that.
However, she kept a very clean, tidy house, she worked, she didn't drink, I was provided for.
But that was the extent of it. Similar to @Dogateahotdog she didn't ever chat to me, or cuddle me, or do crafts etc.
I can remember going to a friends house, and she had a dressing up box of outfits her mum had made / collected for her, she had a booster seat in the car, they did crafts together, she had films that her mum had taped off the tv for her.
I just didn't have any of that.
Similar to @comoatoupeira my mum had parents who she would laugh about and look down on. For her, it was mums who drank and went to bingo. She felt superior to them, felt she was doing a great job because she didn't do that.
But there was so much lacking.
I turned up to every event just clueless and never with the right kit or a packed lunch or whatever. Never had a warm winter jacket because she just never thought to buy me one.
If I did ask for something like that we would go to the shop (only shop in our town) and she would stand with pursed lips while I chose the item, then pay and we'd leave. (She hated spending money). But she never helped me check it was the right thing, or that it fitted, or that it was warm enough etc etc. I can remember seeing girls with their mums and the mums would be fussing over them, smoothing clothes down, doing up zips, getting a different size etc. I was left to just use my own judgement from such a young age and I invariably got it wrong.
Having said all that, she is a much loved and very involved nan to my children. She adores them and does a lot for them, in a way that she didn't with me.