I would like to understand why people complain so much about their roommates not coming out of their room?

I've seen a lot of people complaining about their roommates staying in their room like it's a bad thing which I would like to understand more why it is seen as bad.

If it's like yeah they don't clean, a completely nightmare person that I can understand. But if they're just in their own room doing their own things, why is that a bad thing to you?

I'm asking this because I am that person. I stay in my room 24/7, not bothering anyone and I like to keep things clean like a psycho but doesn't mean if someone spill water a little on the counter will make me go mad on them, that happens all the time and it's completely okay.

I just wanna understand and see your perspective why being "inside" a room and not going out is a bad thing, I'm honestly curious.

For me personally, I hate going out, especially in Finland, I would rather not make friends and stay in my own comfort watching videos, playing games moderately and just be by myself not bothering anyone nor anyone is bothering me. I'm happy and my roommates are chill girls.