I like to shoot for the middle ground: skim for key functions and check those, run code locally to see if it does roughly what I think it should do and if it does merge it into dev and see what breaks.
Small PRs get nitpicked to death since they’re almost certainly around more important code
It was actually pretty great when I worked for a company making things here in england:
“That needs to move 50cm” meant it had to move exactly 500mm
“That needs to move a foot” meant just kick it over about a foot
It was just an unspoken thing that metric meant precise and imperial was just caveman measuring