I'd like to hire you to eradicate the multiflora rose and wild parsnip on my property using only salt and vinegar. What would you charge to do this?

Why would I use inputs, when I can feed a mixed herd of goats, sheep, chickens and pigs to eat your rose and wild parsnip and turn it into food for my family, neighbors and community? But sure, if you want to pay me, I will take payment. At the end of my herd's eating and working your soil, you'll have plenty of manure, green manure (ultimately), and should be ready for planting whatever you want. This is exactly what I do with wild parsnip today. I don't eradicate multiflora rose, but instead, propagate it where I can. My hives work it with great delight, and it makes an unbelievable-tasting honey. Obviously, its also a great edible for us humans, and makes a fantastic tea.

I guess those dumb farmers just wanted to waste money on roundup then. I mean come on.

There are no salt and vinegar resistant crops. The desirability of glyphosate is that it lets you selectively cull all but your GM crops.

This is not desirable to anyone who cares about the soil microbiota, and in turn their and their family's microbiome, gut health, long-term health. As always, there is an unbelievably high price to pay for human convenience.

I'd like to learn more about this.

I had to look up Hobson's choice, neat https://en.wikipedia.org/wiki/Hobson%27s_choice

While seasoning your weeds can be tasty and fun, it is significantly more labour intensive than Roundup. The additional hours put in to alternatives stack up quickly.