So these lenses are really hard to justify in my book.
Of course, the key phrase here is "in my book" because every shooter has different wants, different needs, and different means,. In my own case, I am just an amateur photographer on a budget. My largest M4/3 camera is an Olympus EM1, and while a few of my photos have been published, the income derived is truly tiny. So I lack the motivation to buy $1,200 prime lenses.
I do own all four Olympus f/1.8 prime lenses (17mm, 25mm, 45mm and 75mm) and I absolutely love them all. They certainly perform well enough for my own needs, and were relatively painless to buy.
I do think the f/1.2 primes are certainly measurably better, but only if you need the extra speed, the weather sealing, are using a larger M4/3 camera (EM1 II, GH5, G9, EM1X), and don't mind the expense.
So I am in 100% agreement with you. I cannot justify owning them.... "in my book". But I can understand why others might want them. And I am also glad that they exist, because they make the entire system more desirable.