When you choose to have children, you take on the responsibility of looking after them all the time.
Yes, it's nice if people help, but you can't go into parenthood with that expectation (unless fully discussed in advance and even then people have the right to change their minds).
My parents are 300 miles away (we moved for work) but raised 3 DC alone, away from their families. In laws are one hundred miles away, had masses of parental help (in fairness, their parents were in their 40s when DH and SIL were born). They do lots for DH's sister, sod all for us.
Having not been near my GPS as a child, I didn't have that expectation of help but it was very noticeable once SIL had children that ILs were happy to support her. It used to really bug me until the day I had a long chat with DD post school about life not being fair (in a school context). It isn't, you can let it annoy you but that only affects you. I have less of an issue with the in laws having benefited from childcare, more of an issue with the inequitable treatment of the grandchildren.
So we just get on with it. When DC4 arrived 6 years ago, we decided to pay for childcare. We have the loveliest nanny and I found a term time job to fund it, which still gives time with the children. I'm fourteen years in to having children and my only time 'off' tends to be for work. My parents still try to help but are older now and have done enough for me and my siblings. But we have found our own way to deal with it, our nanny is one of the family (and happily is still with us despite hours decreasing as children grow older). And we are a tight unit.
I get very annoyed by the people I know locally who expect childcare and then whinge because it's not offered as/when they want or the GP doesn't look after the children as they expect. I will be more than happy to help mine when older but would not wish to be tied to a regular commitment. Most parents are ready for a break after 20+ years of that.