“Haven’t heard this from anywhere, but maybe we are thanking Hashem for making us into men despite women being on a higher spiritual level.”
This is a myth invented to appease feminism. Women are not on a higher level. You will not find any classic source that says such a thing. I can show you several that say the reverse though.
The idea also doesn’t fit into this context because the brachos work in a certain order, goy, slave, woman. Is the goy higher than the man too? And why would you be thankful for being made less spiritual?
Here is a great explanation from Rabbi Soloveitchik:
from the addendum to the Rabbi Joseph Soloveitchik Siddur
(R. Isaiah Wohlgemuth, Guide to Jewish Prayer, pp. 59-60, said in the name of Rabbi Soloveitchik)