In general, that’s the really cool thing about polyamory: I don’t feel the pressure of being everything for someone
This is interesting - to me it sounds like the person doesn't handle relationships well. Or at least, doesn't handle relationships the way I understand it. I've been with my partner for 3 years now, and we have our own bedrooms in our house, but we sleep in the same bed. We have our own hobbies and circle of friends that overlap every so often, but have enough room that we can both go out one night and not encounter each other.
I think our method is healthy. We support each other, we do a lot together, but we certainly aren't being everything for one another. Alone time can be in the same house as each other, neither her nor I need to go to someone else to get everything we need.