I do think many babies passed away.
MIL says she weaned DH at 4 weeks!!! DH is 40 so it wasn't really that long ago. Was that what was normal practice with 'hungry' babies?
I do however think its easier to breastfeed now than it was decades ago...
Don't shout me down all at once...
So, now we understand breastfeeding better e.g. we know that you don't 'run out' of milk. We are aware of cluster feeding and how milk production works so there may be a few days (running into weeks for me) that the baby feeds lots and your supply is being established and this increases during growth spurts.
We also have fabulous pumps now so we can truss ourselves up like daisy the cow. I used my pump to express milk which I gave to my daughter in a bottle because she was too sleepy to feed. This was essential as she was premature and I wanted to breastfeed her.
Overall I believe formula has its place but with modern methods (e.g. expressing) there are fewer reasons now why babies can't be given at least some breast milk daily and for longer. If that makes sense.
For example a hungry baby could have mostly formula feeds but maybe 2 breast feeds per day (expressed or direct from breast)
My method of expressing did allow me to work back to breastfeeding but there was an f'ing great dollop of determination and a fantastic but very strict midwife who advised skin-to-skin for half an hour 3-4 times daily until I established feeding. (I only did ever do twice daily but we still got there and are still feeding well at 6 months plus some weaning foods).
This statement, like many things is not black and white...