2 is 1, 1 is none...
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??? 3 knives..please explain that level of redundancy vice 1 knife in a location that is accessible by either hand.
..."too much stuff to mess with" make me think of the divers you see in pictures carrying up to six or more tanks. Is that too much to mess with also?
I've read about 2 cutting tools for solo diving. I guess if one isn't reachable even if it's supposedly within arms reach at all times. Maybe in the event one is dropped?
when you go in on your own, you have to be mentally prepared to deal with any issue that arises.
i wouldn't bother with 3 tanks. get a bigger backgas tank and sling the 30 or go to backmount/sidemount doubles.
the 30 is a bit shorter and less likely to interfere with a thigh pocket, but you can always bungee your smb to your plate instead of the pocket. or sling the 30 on the right side.
The only gear you need
Buddies are not redundant, they can get you hurt.