The feature could be a workaround for a bug. That is, one of their internal services didn't handle being blocked well, and instead of fixing that service they just added that feature as a temporary workaround to make sure the new firewall functionality didn't break any important/core features of MacOS
I'm not saying this is what happened, but without actually knowing what happened we can't assume the intention was to exclude everything in this list forever either.
I'm not saying this is what happened, but without actually knowing what happened we can't assume the intention was to exclude everything in this list forever either.