I have liked living with a partner in the past but so many little annoyances add up and constantly being around each other makes the time more mundane and less fun.

This is kind of how I feel as well. Maybe the first couple months to a year are fun, like a never-ending sleepover with your best friend, but it does wear off a bit. I like to have my own space to just exist, and do whatever I want. Constantly having to compromise over small things like the temperature, how the dishwasher is loaded, how often to wash the sheets, what shows to watch, what to make for dinner, what kind of hand soap to buy etc. gets old. Even if you mostly agree on these things, having to always confirm with someone can feel tiring after awhile.

I lived alone in a nice studio apartment for a little over a year, and I honestly loved it. It was maybe a bit lonely and I guess that's the tradeoff in an LTR for me-less personal space for more companionship.