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I can think of many dives I would not do solo that I might contemplate with a competent and committed buddy. It has nothing to do with lacking skill but rather a realistic understanding of my own limitations and the fact that I have to operate as an autonomous unit. While it is true that a diver should be able to exit a dive safely when buddy separation occurs it is not the same as continuing a dive alone or coping with problems that could occur during a dive.
Dave Shaw felt descending solo was as safe as doing so in a team but there was no way Don Shirley could have survived his vertigo if he had planned to decompress solo.
A competent buddy team can share resources and problem solve to a higher degree than a solo diver can so it stands to reason that a cohesive team could take on dives of a higher commitment level and deal with more complex issues. That doesn't mean that a solo diver cannot do difficult dives, it just means they have to understand how they are limited and avoid circumstances where those limitations could effect the dive.
Dives that require long deco obligations can be problematic when solo. Fatigue can become problematic. Vertigo, Hypothermia, Narcosis... I would seriously question someone who believes they can cope with all problems equally alone than with a competent partner.
Another aspect to consider is what happens post dive. Some boat divers may not get that but I dive remote locations in cold weather and water. The dives I plan solo need to have a consideration of getting in the water, getting out, and being able to drive away. I would accept far more exposure in a group than I would alone. For example, I need to be reasonable sure I can deal with a full drysuit flood at the worse possible moment, exit, regain my vehicle and rewarm. The dive commitment level I would accept in that regard solo is less than I would in a group.
This would be my exact philosophy. Of course the key word is "competent" buddy (team). We all know the argument that a buddy who is not good, prone to panic, etc. can be more dangerous than going solo. But that (like most of a "solo" thread) is old news.