H&M didn't do the post partum photos on the hospital steps, which they were perfectly entitled not to do, and frankly no one cares about that. They did do post partum photos in Windsor Castle a couple of days after the birth - which is pretty much the same thing.
The issues surrounding the birth is that they stupidly (their MO frankly) tried to play games with the Press. Releasing a statement saying she had gone into labour, when she had already delivered and was back home. And then quickly releasing the announcement of Archie's birth.
No one cared about the hospital steps photos, the issues all stem from the idiocy around the labour/birth Press releases.
If H&M wanted a smaller, more private wedding then they absolutely could have had this. They didn't need to accept his family's money. But they did and they got the ceremony they planned.
If Meghan didn't want the big TV wedding, with a Royal tiara, within the grounds of a Royal castle she absolutely could have had it. I find it baffling that people think this wasn't exactly what she hoped for (smaller if anything IMO).
As for Harry marrying into the Markle Family - yes he did. But he's never once met his Father-in-law, or any of her half siblings. Her Mothera side of the family weren't invited to the wedding. So again, they got the ceremony they wanted, and the marriage they wanted. (I will always find it utterly bizarre that you could marry someone and never once meet one of their parents. Thomas Markle made some stupid decisions, but he didn't do anything H&M haven't done themselves).
Edit to add: her half siblings appear to be appalling frankly, so I can see why he never met them, but to never once meet her father? Weird.