The ultimate point of capitalism is to receive money for nothing. Shrinkflation is just the natural next step until a final subscription service for a wait-list spot to receive when the next batch of product is released.
I've seen the argument made in complete seriousness that it's better for portion control so that people don't overeat, particularly when it comes to fast food portions.
Like corporations give a fuck about that. Overeating is more profitable for them, so that's what they'd prefer people do.
So with shrinkflation, what's the long term goal here? I mean, at some point you can't make the product any smaller right? Surely we won't be paying $75 for one microscopic piece of flour.... right...?
At some point they reintroduce bigger sizes again while keeping the previous price. They can then go back to decreasing the size of the new big pack that is more expensive than the old big pack.
Capitalism breeds innovation to con you out of all your cash in more effective ways.