I mostly care about links inside the man page (look at man bash — there are tons of internal references like "described below under CONDITIONAL EXPRESSIONS" or "section SHELL BUILTIN COMMANDS below", or operators being underlined and looking like hyperlinks, which you can't easily interact with to just go to where they refer to. You have to employ full-text search, but it also turns up the references themselves, and good luck searching for the place where e.g. command "." is described) and links to other man pages, not the normal Internet URLs being clickable (those things are trivially copy-pastable into a browser next window).