This is for intelectual purposes only, as I am curious.
Searching through google, I cannot find a definite answer to this, so as the subject says, why is it not recommended? What can go wrong?
The only ref I get is about a security warning posted here : http://www.magentocommerce.com/blog/comments/security-update-for-magento-base-url-configuration-value/ which is from a very early version of magento.
It has come to our attention that under very specific conditions there is a security issue in Magento 1.0 through 1.0.19870 that may cause invalid links to be entered into your block cache.
Can someone maybe clarify what / how this worked, and is it still an issue.