Depends on which too. If it's a Souls the summoning and invading mechanism is very generously sprinkled from top to bottom. Soapstone messages are everywhere too. Even when played offline NPC summons and invasions are still there to fill in for other players.
I can't see a focus on loneliness, but rather on being suprised by a stranger's interaction who's company you never expected.
Also, this Eurogamer interview delves into what inspired Hidetaka Miyazaki to approach multiplayer as he did.