I feel like my phone is so sluggish when in low power mode (even a 17 Pro), that it could work for this.
My (teenaged) kids frequently let their phones go into low battery and then run in power saving mode for hours, when one of them hands me their phones it's super jarring and feels awful to use coming from my 120hz phone haha.
Example from a few seconds ago: I frequently click into HN user's profile pages when I read an interesting comment from them as I scroll past. At home, it loads ~instantly even on 5G. But when it takes 5-7 seconds to load one, you get a lot more thoughtful about navigating your browser.
There's definitely something interesting about intentionally downgrading your own experience in targeted ways.