Wow, I can understand why that feels wasteful.

But ... it boggles my mind how someone can change their wallpaper in my mind) 435 times in roughly 3 years. That's a new image every (365 * 3) / 435 = ~2.5 days, all year around. Maybe less if not all files were old images, I didn't read the screenshots too closely.

I'm generally not even aware of the desktop background image (and thus never spend time to change it), it's always covered by actual application windows. Interesting.