Some people might like a redesign, some don't.
Also, there might be some technical differences, e.g. YouTube's Polymer design is a progressive web application, which can have benefits such as mini player, but disadvantages such as longer initial loading time and especially Wayback Machine incompatibility, but thankfully, Archive.Today's Chromium-based crawling engine since 2019-11-29 supports progressive web applications.
Since today, ?disable_polymer=1
(or “ disable_polymer=true
” ) or an old browser user agent can no longer deactivate the polymer design, making YouTube another limbo to the Wayback Machine, but like I said, thankfully not Archive.Today.
Forums.XDA-Developers.com has a style chooser at the page bottom that supports every style since the forum existed.
(post is archived)