It seems like the key though is ensuring that your environment uses distinct non-root users for all security relevant processes so that a security bug in one process doesn't allow the attacker to gain access to others.

EDIT: On second thought there may be some advantage to effectively zeroing memory for security critical data within a process but the likely value add seems low to me. Once a process has been hacked it seems pretty unlikely that you can hope to control what information it leaks.