it's actually not that most babies will be 'fine' on formula. sadly, like it or not, most babies who are struggling with bf, not putting on weight, constantly hungry, unable to take a proper feed, never stopping feeding, never sleeping more than a couple of hours etc etc etc are a damn sight more than 'fine' on formula.
many, many, many women have seen their babies overnight thrive by supplementing with or switching over entirely to formula. you can't just discount all of that reality because it doesn't fit with the pro bf lobby and it is insulting to do so.
many,many,many women put themselves through months of hell trying to live up to how wonderful, easy and perfect bf is and only switched at the point of utter desperation to find that instantly they had a happier, healthier baby and a hell of a lot happier healthier self.
if breastfeeding works for you and your baby then fantastic! good for you and them and enjoy. it's none of your business how any one else does it though. to say it's just a short period of time till it gets settled belies the experience of women who spent months flogging a dead horse trying to get breastfeeding to work for them and their baby. i don't think women who it all worked out fine for are really in a position to advise women who it isn't working out fine for.
there is also the practical weighing up of what needs doing and what the important things are and whilst feeding is obviously very important there's a lot more that needs doing too for a happy healthy mother and baby. if it comes to mother actually having time to prepare something vaguely food like to eat herself or breastfeeding (which is not going to go well if she is malnourished anyway) then you weigh it up pragmatically not ideologically.
as a single mother determined to breastfeed and getting mighty defensive with anyone who loved me and didn't like to see me struggling suggesting i should give formula/give more formula i really could have pushed myself beyond coping. i probably would have if it hadn't been for some bossy midwife/hv three months in telling me i was doing it all wrong by giving formula for a pre-bed feed and bf the rest of the time and how i needed to stop giving that ff in order to bf properly. thanks to her - and her catching me on an exhausted, paranoid about my babies weight and generally weak day - i cut out the nightime formula feed and set off a whole new 7 shades of hell saga for weeks which finally ended up in me giving up bf entirely and doing a combo of ff and ebm till i finally accepted formula would be fine and it wasn't worth putting ds and me through hell for an ideology.
the sooner people accept breastfeeding just does not work for some people -not because they haven't learnt to latch on properly or because they haven't given time for the supply to set in or ra ra ra orthodoxy but because they've genuinely done everything right for months and it just has not worked the better. it would save a hell of a lot of women from months and months of misery and stress and a hell of a lot of babies from crucial early months with a miserable and stressed mother and whatever risks there are from not getting enough nutrition.
i honestly would not be surprised if we see a lashback in a decades time of kids with brain issues that they finally discover are caused by near starvation in early months of life whilst hvs and the like stood by saying don't worry, baby won't starve to death, it's all natural and good. forgetting of course how many babies used to die before 12 months of age in the good old natural days.