Balancing ft work with caring responsibilities is incredibly challenging. Your setup sounds very generous, OP.
There are lots of variables (working hours, availability and affordability of professional childcare, availability of family childcare, numbers and ages of children) and it's hard to envisage a simple solution which works for all.
I've paid a lot for childcare over the years (lone parent, full time job but standard hours). It's easy to feel jealous of families with willing/able grandparents, or of those who've benefited from more generous state funding (30hrs at younger ages etc), or who are wfh whilst caring for children. Mostly I try to resist that though because it's hard all round, and I'm sure there are things others in those setups (or others) might envy me for: I've always been home to do bedtimes, for eg, and I've kept a stable job which will hopefully start to pay off more and more over time.
I'm sorry, I can't bring myself to click the guardian link, because RLC drives me slightly mad. Her writing might have resonated more with me when my children were the same age, or younger than hers. It always feels a bit like old news.