Hacks have always brought the coolest features to phones, but OEMs have made them less accessible than ever :(
This longer delay won't prompt hectic headlines about users angry about random reboot, it is long enought so federal agencies won't publicly react and plea Trump for their backdoor again, and it is a low profile update that won't necessarily be noticed beside tech circles thus "small fry" bad actors won't know how to correctly cover their back.
A user hostile design would have been to never implement it in the first place. It's basically Apple's signature to choose generic default value and don't bother the user (for the better and sometimes the worse).
It apparently only triggers if the phone hasn't been successfully unlocked for three days. So, it really isn't something most users will notice.
I remember reading somewhere that many new exploits in the mobile space only exist in memory and are thwarted by a simple reboot, including the infamous Pegasus spyware.
AFAIK (from observing GOS comm channels) verified boot (alternative OSes but even the mechanism itself since some OEMs customize quite a bit), hardware rate limiting and timely security patches (which include modem firmware, preloaders - i.e. hardware) are the main reasons other devices are not supported.