> All software has bugs, so if you add two buggy security solutions, you might only be able to exploit a bug in one, but the other still gives you the safety.

> All software has bugs, so if you add two buggy security solutions, you might only be able to exploit a bug in one, but the other still gives you the safety. I am unconvinced about the last part. More commonly an exploit in either will cause security to fail, so adding more steps just adds more attack surface and leads to less security.