An example I have is a food orders website, which takes 4 seconds and 10MB to load, where all I want to do is go unsubscribe for the weekly order (where I need to unsubscribe every week because it's opt-out, I guess it's better for them). This page is crap because it can, not because it brings some value it couldn't without using all that compute power.

Then as a software engineer, many colleagues literally say "memory is cheap" very often, which kind of hints towards the fact that they don't care about optimizing for memory :-).

I honestly cannot really think of something I do now that is really useful for me and that I was not already able to do 10 years ago (hint: I don't use a copilot to code).

For 90% of browsing like searching and reading articles or watching video or using email, all of those worked on the almost same functionality 10 years ago with a fraction of the memory.