Real intimacy requires investment. Relationship anarchy, any time I've seen it attested or practiced, faciliates the opposite. It's a fetishisation of alienation. What you're describing as 'pressure of expectations' can be understood very differently, as the expectation of reciprocity. In other words, being able to rely on people - whether as friends or lovers, when things get difficult. Without that, all we have is limerence and capriciousness.
I say all this as someone who's been in non-monogamous relationships of various kinds - from weeks to years. Without the possibility of commitment and the acknowledgement that all relationships are inherently hierarchical, we atomise individual needs and make real enduring connection and community impossible.
A group of people sleeping together is not a stable community. It's filled with people who are trying to sleep with other people inside and outside of the group who are vocal about being able to spend time, money, and effort on others for sex. There's nothing binding a group like this together besides sex.
Even normal community activities like volunteering or sports clubs have drama and people who end up hating each other. Add sex in the mix and you've created an explosive dynamic.
1) Does not prioritize you
2) Finds somebody they like more than you
3) Not actually happy with you but still uses you
4) Is going to get STDs from other people
5) Will have less and less time for you because of others
6) Believes children can be raised "by a village" instead of their own hard work
7) Wants to involve other people in your life
8) Births a child with somebody else (maybe?) as the parent
9) The mere thought of them with another person grosses you out
For everybody else, there is the normal and perfectly human feelings of jealousy, attachment, fear or loss, and feeling associated with self-confidence.
https://davidgraeber.org/articles/are-you-an-anarchist-the-a...