Pisces closes the zodiac in late winter — the stretch where everything dissolves back and prepares to begin again. That position sets its core: it has no boundaries because dissolving boundaries is the job. Which explains nearly all its traits, including the ones described as faults.
You'll recognise it here: other people's feelings walk straight into your body and you can't reliably tell which are yours; you need a stretch with nobody in it to come back to yourself, and that isn't dislike of people; and your tolerance for 'impossible' is high, because in your experience things never had those clean edges anyway.
Running well, Pisces is the place everyone can be caught in: no judgement, no hurry to fix, simply present. The value of that only shows at somebody's worst, and at that point it matters more than any advice. Blocked, no boundary becomes no self — taking other people's needs as your direction, or handling the unbearable part by leaving (sleep, fantasy, any form of going offline). The tradition links Pisces to the ocean and to dissolution, and the point isn't vanishing, it's returning to source and coming back out. So Pisces doesn't need to be tougher. It needs a few artificial edges — fixed times, fixed places, fixed people. Given banks, the sea isn't only a flood.