Umm. I you sure you were meant to do that ?
OP, I think you are being a bit moany and unrealistic tbh. To be fair, have no idea what the PN care is like where you are and appreciate it may not be as good as mine (where I live the maternity care is fantastic: an/intra-partum/pn all brilliant.
I have no desire to stay any length of time post-natally in hospital. I also think that it is inappropriate tbh; in a hospital you and your newborn are vulnerable to hospital-acquired infections, apart from anything else, and really, CS/complications aside, there is no clinical need for it.
The NHS was founded on a myth; that healthcare is sustainable. Guess what? It's NOT. The sky is the limit when it comes drugs and various other treatments.
I also think it shouldn't be all about want new mums WANT; it should be about what is needed and clinically proven to be helpful. OK,you might fancy 2 weeks in hospital being waited on hand and foot, but actually that is neither helpful nor affordable. The last few generations are, imho, abominably spoilt and selfish. This is not about your "rights" as a healthcare "consumer"!
I am not saying that postnatal care shouldn't meet your postnatal needs and if your "horrified grandmother" really feels that her daughters WERE discharged without ANY follow up (which I am a bit dubious about) then of course a complaint is only right and proper.
But I think we should all be a bit more grateful and a bit less grabby. And try thanking God you are not poor and uninsured in the US.