An entire wing of our squadron was dedicated to helping CMDRs get started in the "baby bubble" (starting area), helping them build ships, etc, with no seduction involved (as in, we'll only help if you join us).
There was also a huge benefit to joining a squadron because you learned who the ganker squadrons were and had backup if you ran into them. Squadrons know the other squadrons on their respective platforms. Ever since I was part of a squadron, if I see certain clan tags I know what I'm in for.
I worked alone for years, using any help I could get from random players I met in the game. One of them formed a small squadron supporting one of the factions I supported & I joined them. In general I derive motivation & inspiration to take on projects & challenges/achievements from people I meet in the game. Sadly the community has largely moved away from enabling that kind of play, most of the big groups started the way I continue to play, one person or a small group figuring things out as they go.
Not sure I could ever really bring myself to join a large group, I've worked with a few though, and against others. One of the rare occasions where the squadron I'm in used a private group was when helping an ally against another ally where the group we opposed had chosen a selfish path rather than one that benefitted both parties and I didn't want to be known to be going against them. We lost out on that occasion anyway
Another time I changed to group was against a group who had a member that was struggling with stress (anecdotally) and I didn't want to be the cause of any more for them thinking I might interdict (I wouldn't anyway (not a guarantee)). imo that player probably should have switched to group or solo themselves if the circumstances were as I interpreted them. I can't control what other players choose to do but I can control how I behave, react & respond.