It's the convenience/brand power stuff that is really spiked. Fast food falls into that.
If you rely on staple vegetarian food for the bulk of your calories and then “decorate” with fresh fruits and vegetables, you can eat very well for not a lot of money.
The Draper Valley Farms stuff is generally cheaper than the Kroger-branded stuff, no matter the cut. Like right now, boneless thighs are 50c cheaper per lb (no sales). It's $6/lb vs $6.50/lb. Bone-in is $3.79/lb! The Kroger brand doesn't even offer that variety for some reason.
A few lbs of that + some orzo (cheap) + some staple produce (shallot, cherry tomatoes, garlic) can make you 6 very filling and delicious meals. When you compare it to fast food, the difference is staggering - definitely a divergence compared to the diff years ago. It's the convenience stuff that is truly spiking. Groceries are definitely a lower % of my income than half a decade ago.
The barrier to most people is they can't process a whole chicken.