User blog comment:DaNASCAT/Technical Update: January 6, 2016/@comment-24473195-20160107161235/@comment-24473195-20160107184008

"don't consider how a script is coded, or how much code it uses, as a factor in the benefits: I only look at the features' it offers"

That's one of the reasons why Javascript review now exists. Most admins don't consider anything beyond features. Someone can write a featured script that causes all pages to take 2 minutes to load for everyone but admins, and does many other nasty things that aren't visible to the them, and even affects wikia's servers. This would be invisible to an average admin who doesn't know much about javascript.