I can only speak to my own experience, but for the last 1 year I have been by myself and my 2 younger daughters in a new town. I work remotely, but also have some very good friends that I can rely on when I need. Those friends are distributed all over the world and while I can call them any time off the day or night, there is a fundamental difference how I feel after a phone/video call to after a conversation over e.g. drinks/dinner. In fact I found that I sometimes avoid calling my friends because the phone call makes me feel lonelier.

So for me online communities can be a great thing, but they can't replace IRL communities, because the interactions make you feel different. I suspect that the social needs that evolution has imprinted on us can't just be fulfilled by online interactions, they require more senses than just hearing and seeing.