The same was said about a multi-tasking envirnment (Score 1)

This reminds me of the old debates related to multi-tasking on the Amiga versus non-multitasking OSes at the time. It's really a question of whether developers take advantage of the (security) features made available to they by the host operating system. How many legacy Microsoft applications risk breakage by incorporating new security features while they're in the user feature upgrade process? The same will be true of a developer on any operating system if they just keep adding on top of obsolete/insecure code and practices.