Another thing I would add, is that by the time you are good enough to do Exploration grade dive adventures with a team....you are already an absolutely self-reliant diver, AND able to instantly recognize issues with others and assist if needed. In other words, with the advanced training and experience diving that goes with the advanced certs in Cave or Tech like GUE or UTD offers ( not that it is limited to them--they are just easier to paint a picture with), if you needed to be solo for some reason on a recreational dive, it would certainly be a non-event skill-wise. On the other hand...diving is a very social activity --- I really enjoy it a lot more with friends--which in diving we call buddies.
In Snow skiing it is similar, in that the thrill of blasting down a Downhill run at Beaver Creek is going to be more fun with your friends, than it would be if you are out skiing by yourself all day. Sharing the experience. So many of us plan a dive trip with WHO is going with us....and this WHO is actually a key part of the planning--making sure it happens as is planned. As with Skiing, if something happens and you end up skiing by yourself--oh well...you can still ski, but it is not as much fun....and would be a stupid waste of a vacation to plan a dream ski trip solo. Just my two cents.