There is a time to do both solo and group. When I want to get tipsy around a campfire and B.S. with people I'll hit the annual family campouts. But, if I want to do some exploring I only go alone.
I think that rig capability is a big issue when exploring. I have a rig that is small, will go pretty much anywhere, and I'm not afraid to lose some paint. I've found it's very difficult to find a camping partner that has a similar exploring plan, a similarly capable rig, is available when I am, actually shows up, and is not a butthead.
In fact, it's come to my attention that I may indeed be the butthead.
My dogs keep me company at camp and they are generally in the mood to do whatever I want to do. That said, I've never gone on a long trip (real overlanding). Can't even imagine what it would be like to coordinate with that many people for so long a time.