You are not being unreasonable at all. What really shocked me was the study that fed two groups of people a diet matched in macros, same amount of calories, sugar, fat etc but one was UPF and one wasn't. The UPF group gained much more weight. It's not surprising when you start looking into it more. UPF food is often extremely moreish, softer in the mouth, easier to chew and therefore easier to eat more of.
I think I'm right in saying that NOVA came out of Brazil where the rise in UPFs saw a huge rise in obesity rates in the population. That pattern has been shown again and again across different countries.
I'm not perfect at all, I aim for 80% of my food to be free from UPFs. I focused on the biggest culprits first that we ate often:
Bread - swap to Jason's for sliced bread and rolls and Crosta and Mollica for wraps.
Flavoured yoghurt - swap to plain greek yoghurt with fruit.
Bacon or ham - swap to parma or serrano ham that is just pork and salt.
Spreads - swap to butter
Cereal - swap to Shredded wheat (100% wheat and that's it), porridge oats or one of the granolas that doesn't have any UPFs. I use Bio&Me.
Instead of a ready meal on a busy night I'll have scrambled egg on toast. It's made just as quickly and is better for me.
I still have the odd diet coke, and I still love crisps! But I try to buy the ready salted crisps in the white packet from Lidl that are just potatoes, oil and salt.
I'm convinced that doing the above has been better for me and better for DDs.