It is not yet good enough or there is not yet sufficient trust. Also there are still resources allocated to checking the code.
I saw a post yesterday showing Brave browser's new tab using 70mb of RAM in the background. I'm very sure there's code there that can be optimized, but who gives a shit. It's splitting hairs and our computers are powerful enough now that it doesn't matter.
Immateriality has abstracted that particular few line codes away.