High
A built life is a requirement for you: their own direction, their own weight carried, no quiet assumption that you'll be the infrastructure. For a lot of people who land here that isn't a preference so much as a conclusion drawn from a relationship where they were exactly that. It's worth saying clearly what this standard is and isn't. It isn't about money — the statements behind it ask about direction and self-management, not income — and wanting it isn't a character flaw. What it is, is arithmetic: a high bar here narrows your field, and it narrows it in a way that has nothing to do with your motives. The other honest note is that a built life proves someone can manage themselves. It says nothing at all about how they'll treat you.
Moderate
You want to see that someone's life basically works, without needing it to be impressive. A hard year doesn't count against anyone; a pattern of years does. That's a sensible bar and the most common of the three settings, and it does most of the protective work a high one does without narrowing the field the way a high one narrows it. Where it asks something of you is in telling the two apart. A rough patch and a way of living look identical from the outside for the first several months, and this standard leaves you doing that judgement yourself — usually well, occasionally late, and almost always with less information than you'd like.
Low
How built someone's life is doesn't function as a filter for you. Between jobs, mid-change, starting over, working out what's next — none of that disqualifies anyone, and you're able to see the person separately from the state of their circumstances. That is a genuinely generous setting, and it means you'll meet people at the moment they're least impressive and most themselves. It carries one exposure worth naming plainly: someone's ability to carry their own share is the thing this standard measures, and a low bar makes it easy to end up carrying more than half without ever having agreed to. Not because you were used, usually — just because nobody checked, and you were the one who could.