Besalel, it is logically deficient, because where does it say that it’s a flaw? Also halevi never said that it’s an actual flaw, chas veshalom, but rather intentionally designed to mirror a flawed human condition – that Hashem made us with flaws is very obvious. That was on purpose, not because of, chas veshalom, any mistake of Hashem.
As to why we don’t make a bracha…my theory is that to make a bracha, there needs to be a ????, a tangible, physically reactive phenomenon. The eclipse is merely an alignment; nothing is ????? in the moon or sun.
A rainbow, one could argue, is also not a cheftza, but the bracha isn’t because of the wondermen, it’s because it’s a reminder of Hashem’s promise to not destroy the world again. That’s why it is a bracha of zocher habris, not oseh maysoh bereshis.