pro-life folks would argue that it should be at conception or something, pro-choice folks would say it should be at birth, but so far nobody's come up with any reasonable one that comes after that

That's very much a description of the US landscape of memes. In the EU the situation is different as our abortions laws are made by elected parliaments.

In most EU states an abortion at 7 months (or 28 weeks) is illegal in the US it's legal. I haven't meet anyone in Germany who argued that Germany should allow abortion in more cases and have birth as the schelling fence.