It is the only line with a reputation bad enough that people write to ask whether they should move away from a city they like.
The reputation, and where it comes from
Saturn is the traditional significator of limit — time, structure, authority, the bill arriving. Applied to a map, that gets translated into *this is where life is hard*, and a great deal of popular astrocartography advice stops there and tells you to stay away.
The translation is lossy. In the older material Saturn is not malicious so much as unsentimental: it is associated with things that take a long time, cost something, and hold their shape afterwards. A place described as restrictive by a system that also describes qualifications, discipline and expertise as restrictive is not straightforwardly a bad place to be.
What people describe
The accounts are consistent enough to be worth repeating and are still just accounts: that things take longer than they should, that the city withholds approval, that ordinary logistics carry more friction than they did elsewhere. Very few people describe a Saturn line city as *fun*.
The same accounts often carry a second half that gets quoted less. People describe getting competent there — finishing the degree, learning the language properly, building the thing that needed four years rather than four months. Whether that is Saturn or simply what happens to anyone who spends four hard years somewhere is exactly the ambiguity this whole subject lives inside.
Which angle it is on matters more than usual
Saturn on the Midheaven is the version associated with career and public standing: slow advancement, senior people who do not hand things over, authority arriving late and then staying. Saturn on the Ascendant is described as more personal and heavier — the sense of being aged by a place, or of having to be the responsible one in every room.
Saturn on the Descendant lands in relationships, and is associated with fewer and more serious ones rather than none. Saturn on the IC goes to home and family, which is the version people find hardest to live with, because there is nowhere in the arrangement to put down the weight.
Who does this on purpose
People with something specific to finish, usually. A qualification, a book, a business that needs a boring decade rather than a good year. If you already know the work is going to be unglamorous and long, a place the tradition associates with exactly that stops sounding like a warning.
It is a genuinely bad idea if you are already depleted. A line associated with restriction and effort is the wrong prescription for somebody who moved to recover, and *I will grow from this* is a sentence people say before a very long two years. If you are tired, this is not your line, and there is no version of the reading that makes it your line.