in reply to In 2019 the site I miss most is:

Other: PerlMonks, but as it exists in some alternate universe where it underwent a major design overhaul at some point in the past 10 years or so.

(I am refraining from discussing specific differences, but this idea goes well beyond things like the incremental changes that have been made over the years, or tricks which a few users have attempted using CSS, etc. This idea could be considered parallel to the modernization efforts of other Perl-related sites, but I mainly consider it to merely be the rejection of or shifting away from the perceived attitude that “PerlMonks’ existing design—as seen by users—is nearly perfect, and should be changed as little as possible”. Resuming hiatus…)