Not sure if you've used shortcuts on iOS but a lot of those customizations don't change the performance of anything. The shortcuts on an iphone add a half second each time you use the app, because the icon has to open the shortcuts app THEN open the app the shortcut is linked to.
If adding a sticker to your laptop increased the boot time a fraction of a second some people would still do it, but many would it find it maddening!
"A delay of less than 100 milliseconds feels instant to a user, but a delay between 100 and 300 milliseconds is perceptible. A delay between 300 and 1,000 milliseconds makes the user feel like a machine is working, but if the delay is above 1,000 milliseconds, your user will likely start to mentally context-switch."
I've seen people mod their car in ways that are detrimental to it's performance. I've also known people who have intentionally bought inferior hardware because it looked nicer. In fact I've seen some people wear shoes that has give them blisters but done so because those shoes were pretty.
You'd be surprised at the lengths of inconvenience some people will endure for the sake of aesthetics.
If adding a sticker to your laptop increased the boot time a fraction of a second some people would still do it, but many would it find it maddening!