I do believe that when you are diving alone there is no room or place for failure.
The point that I had been trying to make is simple and it is based solely on my opinion.
When you are diving with a buddy, you can afford to have less than the best equipment. If you have a failure with on of your products you can simply turn to your buddy, breath off is Octopus and all is dandy. Where one runs into issues is when they are alone with no buddy, the question that comes into play is, is your equipment up to par to save you if you have a failure.
This is the equipment that I bring on a Solo Dive
Two Stage bottle setups. one AL 40 and another AL 80 Both rigged on a Halcyon Stage bottle Setup
Two Twist Style Backup Lights
One Canister Halcyon LED Light with a Goodman Handle
Emergency Transmitter
Drysuit with an Argon Bottle Setup
Three Knifes
BackPlate and Wing setup with a Twinset and a High Lift
Two Masks
High End Regulator both first and Second Stage
I don't take any chances diving alone.
I do realise that there are some people who don't take these steps to protect themselves on a Solo Dive. I am ok with that.
This is just the way that I Protect Myself on a dive.