Yeah guys, I think we all agree that 3 is better than 2.
However, I feel that all Rebreather dives should be run in such way that one is able to bail out at any point during the dive and make it safe back to the surface. Even with total loop failure. So, I do not dive alpinist.
OK, 3 cells give you redundancy, and you can still complete the dive if one fails. I give you that. But I see no harm in just going to SCR mode or bailing to OC if one of the two fails, or even if both cells fail.
Then again, it depends on the type of diving one does. I do not dive overhead environment nor do I do extreme depth/time exposures (yet

) It is all about personal choice (unless you guys are all DIR

fanatics and want to assimilate us all

)
GKAM