Plone disadvantages, SQL Storage capability

Here is a guy who talk about Plone disadvantages

Its been a while since I started take a play with django web framework. I run their tutorial and take alook how to deal with it. At the moment, I compare django with plone. I like plone and I wish to used it as my production area, but I got stuck with their SQL Storage capability.

Plone allows you to store your data on any other RDBMS like MS-SQL, Oracle, PostgreSQL and etc. But, Plone required to store your object metadata at ZODB, and it must. This is it. This is the one that I dont want, Its mean, as my RDBMS data grows, then my metadata on ZODB will grows either. I dont want it. Thats why I keep delay my application to jump to Plone.