I would tend to agree.. That leads to the question os what to do about it. The closest thing to a public repository of schemas is http://ldap.akbkhome.com/, reading through RFCs, and whats included in the source.
Would it be helpfull for a site to be developed that officialy publishes unoffical schema extensions?
http://www.alvestrand.no/objectid/top.html which is not read-only.
http://www.daasi.de/services/SchemaReg/
Ciao, Michael.