I'm a vegetarian, so take this with a grain of salt, but not giving "pigs enough room to turn around and to extend their limbs" seems needlessly cruel. If you can't afford pork, it's not like there aren't cheap protein alternatives.
The sad thing is this is all for a little bit of efficiency to get all the feces easily into a trough. Before most the cages could flat pack along walls so let pigs out for 15 minutes a day pack cages and run a front end loader up and down halls and hose it down. Housing 3-4 sows in a cage most likely one will get bullied a bit and produce some runts but acceptable losses to not treat an animal smarter than a dog like a meat factory.
I don’t think people understand the cruelty of factory farming especially when it comes to pigs. If they saw it first hand, they would almost certainly support this legislation full stop. I love bacon but what we do to these animals is sick and I won’t support it.