Another nice thing about group hangouts is that not everyone needs to be there so it makes scheduling a lot simpler.
However I can't judge, because I personally dislike group hangouts, so I can understand if conversely someone finds arranging 1:1 meetings difficult.
1:1's don't renew. You have to keep feeding the relationship. The relationship can be extremely rewarding for chit chat & conversation, but it could drop at any point, and become a memory. It has no self-maintaining spirit, no ability to repair itself if one person loses some availability or time.
A group can fend for itself in a far different way. Assemblages can have members come and go, but maintain a core purpose and identity. There's rhizomatic affiliations that can find each other & get new currents & excitements going, whereas in 1:1's the potentials for connection are bounded.
Closed systems can only keep processing the same pieces of energy again and again for so long. They can steal some vitality from the surrounding, but the lifetime of the relationship is limited. You need more open dynamical systems if you want to keep interesting things going. Long term survival requires systems that can perpetuate & share themselves. 1:1's by definition cannot.
I'm open to the idea that my suicide risk is higher by not having a large group support network, but I enjoy being alone and I enjoy 1:1 time enormously more than being in groups, and overall I think my quality of life is higher with this choice. Everyone is different of course.
It's like a romantic relationship - once you find "that person", you're done.