I live abroad, moved before kids. Had loads of fun, sunshine, etc. Now we have kids, we are moving back to the UK (taking a break from packing to write this!).
Kids are a game changer.
Being abroad with zero family is incredibly hard, even with the benefit of a nanny. We miss family immensely. It's not about childcare, but the small stuff, Sunday visits, Christmas etc.
Plane tickets have become enormously expensive. It's one thing to pay 2.5k for plane tickets, now we have to pay 5k at least, we need bigger hotel rooms / Air BnBs (which in the South East is a lot).
Because family want to see the kids, we spend all our annual leave on going to the UK. It's not great. We've never had a proper family holiday, it's all spent visiting people. I love my mum dearly but I had not planned to spend ALL my holidays with her at age 37. "Catching up" with people is exhausting.
Career wise, I am better off abroad but DH is not. The resentment builds and can ruin a marriage, seriously.
No social circle when you move means you and DH have to rely on each other a lot and that does break some couples, I have seen it. It puts a lot of pressure.