> А еще динамические либы экономят место и память

Не надо забывать как они, вообще, появились. А появились они, если мне не изменяет память, от того, что разрабы X'ов не смогли адекватную архитектуру придумать, что бы не было огромных бинарников и т.п. В итоге получилось вот это. Из письма Роба Пайка:

When Sun reported on their first implementation of shared libraries,
the paper they presented (I think it was at Usenix) concluded that
shared libraries made things bigger and slower, that they were a net
loss, and in fact that they didn't save much disk space either.  The
test case was Xlib, the benefit negative. But the customer expects us
to do them so we'll ship it.

So yes, every major operating system implements them but that does not
mean they are a good idea.  Plan 9 was designed to ignore at least
some of the received wisdom.