Mainly, the SFB I carry is an integral part of my personal defense profile geared toward multi-disciplinary proficiency providing me the tools necessary to transition between skill sets through various ranges of engagement. And as stated previously the SFB is faster and easier to access under pressure. Why would I carry an inferior tool when I have a legal, superior option available to me?
Here are examples of 4 different SFB options:
Any or all of these can be set up for strong hand access but can also be accessed with the support hand with some training. Or, a dedicated support hand set up can be EDC.