Is there any reason not to enable
https://www.mediawiki.org/wiki/InstantCommons by default? The docs don't
show any.
At least non-standard configuration for cache etc. can need some
adjustments, AFAIK, but it seems it mostly "just works" as expected?
Nemo
P.s.: I had already asked at
<https://www.mediawiki.org/wiki/Talk:InstantCommons#Enable_by_default>,
probably disappointed users would have shouted their NO!