With the documentation chunks in .beam files and the Erlang shell improvements we have function and module documentation in the Erlang shell. This was a much requested feature and I guess that for many users it is a good enough or superior replacement for the Unix man pages, just not in the same shell. It also allows documentation to be presented by all kinds of development environments…
IIRC (the chief responsible are on vacation), we intend to create man pages for the Unix executables, also for OTP 27, in time.