With modern family planning, closer movement towards gender equality, better domestic appliances and things like better maternity and early years care, having a larger family in 2016 is going to be a lot different than say 30/40 years ago.
what a lot of people are describing is the difference between a good parent and a neglectful one, irrespective of sibling numbers.
I suspect today in the US there must be immense pressure from religion and anti-abortion sentiments that mean there are a lot more unplanned children being born which may not be as enthusiastically wanted as older children.
I remember my GP telling my sister and I that they never wanted 5 only 2, but it was the 40s/50s and 3 accidents happened. 2 of the accidents never got over that fact.
If you can afford the time, housing and financial cost to raise the children you want then I think that's a very good start for any child you have.
My own viewpoint on my family is that we chose to have 2 DC close together because my DH has a son and we felt our child would grow up missing her sibling when they went back to mums.
It has worked out well as DS is now s teen and has no interest in playing preschool games when he is here. When he goes home the kids cry but they soon amuse each other after a kiss and cuddle.
As someone upthread said they often prefer to play together than want me. I do try to factor as much one on one time as possible.
We are due DC3, and I know it's not going to be easy. But we made our choice based on the fact I no longer work, which means I am more able to spend time playing with my kids (when they want it) than ever before.
I was also one of 2 and we never got on. I am hoping a 3rd child will mean that if one wants some alone time there is company for the other.