There are other reasons to carry a BUG other than the reload issue.
Number one and why I have done it for over 20 years:
I have a gun accessible to either hand.
Number two:
You can reload just as fast or faster than grabbing a second gun. You probably are not clearing a malfunction faster than you are pulling that second gun(assuming you actually practice it to gain competency.).
Number three:
I can have my weak side hand on a gun discretely for those many times something does not feel right but you don't want to draw a gun.
Number 4
I actually pocket carry my bug. So I literally have a gun in my hand walking around if my hand is in that pocket. You don't get a much faster draw than that, concealed or other wise(Again, assuming you spend a LOT of time practicing.).
When I first started carrying a BUG I spent hours standing over the bed dropping my primary and going to the bug. I have been shooting man vs man drills and run dry with no spares and dropped the gun without thinking about it and gone to the BUG to finish the course of fire.
IMO, If you are going to carry a bug you need to spend as much time developing your skills with it as you do your primary. And if you are carrying it to access with your non-dominant hand plan on spending MORE trigger time with it than your primary until you get running it offhanded down pat. And for CYA document the fuck out of that time and effort spent.
JMHO YMMV