I know this thread is titled 'Reasons you wouldn’t move to US', but many of these comments are depressingly inaccurate and out of date.
So...assuming you would like advice from people who have moved here/live here I would start by saying it totally depends on the area of the US and even the state within the larger area. We moved a number of years ago to New England so I can only talk about my experience here. Your fears of missing family and not having Europe on your doorstep are totally valid. The others, I disagree with.
One of my kids has had one ALICE drill in their school since we have been here (and it is certainly not fear-mongering about possible school shooters). The others, never. We had more of them at their cosy little private prep school in Hampshire before we moved. I have zero concern about guns in my part of Massachusetts. I have never ever seen anyone with a gun. We don't even lock our front door.
Healthcare comes with our employment (we pay a portion out of our salaries) and yes co-pays and deductibles can add up but there is a cap on how much you'd ever have to pay in one year. And you get what you pay for - the service we have had has been incredible. I can get an appointment with my kids' paediatrician the same day, if needed. I wouldn't fault it at all.
My husband gets 4 weeks paid holiday plus 2 weeks sick pay (which people take as holiday). I get 8 weeks. It depends on your employer.
I have not found my area any more car-centric than the UK. If you live in a small town or large city you can walk everywhere. If you live in a more spread-out area it involves no more driving than the UK.
Food is expensive, but it is totally untrue that the quality is worse. I would say fresh produce is more varied and generally a higher quality than the UK. Eating out is expensive, but it's total rot that the restaurants are crap. Some are, just like the UK. Some are excellent.
I don't recognise the above comment about a live to work culture at all. And poor education? We are lucky to live in a wealthy area and our high property taxes go straight into the local public schools. I thought my high-schooler would find herself way ahead of her peers when she moved from a highly academic private school in the UK post GCSEs to an American public high school. I couldn't have been more wrong. In my experience the public school system here - again hugely caveated by which area you move to - is incredibly rigorous.
As someone said upthread, the US has a rich and varied landscape. I value having snowy winters and being less than an hour from a good ski slope; plus we have a guaranteed full 4 months of beach/pool weather in the summer.
I cannot speak for maternity leave.
Whether you move or not is of course a huge decision, but don't base it on out of date stereotypes. It's just not true.