A 10% reduction in cache size in exchange for a 4% slowdown doesn't seem obviously worthwhile to me, especially when it comes at an increase in complexity.
Percentages aren't always the right gauge. uv isn't something I run frequently or for long periods of time. It's like a couple seconds every month or whatever. I would rather spend an extra second waiting every year to have hundreds more megabytes all the time.
>especially when it comes at an increase in complexity.
Or (nasty) bugs hard to debug
Whereas I made a mistake and bought an underspeced MacBook and my 512GB disk is constantly on the brink of full as I reclaim the last 40 GB over and over from different caches, downloads, and wherever else and had to simply give up on several projects because of their disk usage.
Disk isn't free, especially now.
Making things faster is much easier than making things smaller. I'm sure we can win back a 4% slowdown elsewhere since we have so many more levers to pull from.