My Dh took annual leave or arranged shifts around when I had our babies. I think what’s different nowadays is that new mothers leave hospital so very quickly, even after a CS, often without breastfeeding being properly established. Nor do midwives visit daily like they used to. From my DD and DIL’s experience, they only visit every three days or so and sometimes even that is merely a phone call.
Mums need someone at home to care for them, their own mums might not live near or might still be working or have care duties towards their own parents.
I think it’s a cost the government should pick up, though, and not burden businesses with it.