QCA cannot operate independently of QCT anymore. Too much IP and infra is shared now. Divest QCA and it will die.
It would be technically easier for AVGO to spin off their wifi division as BRCM uses more commodity ARM IP. This will not happen of course, for purely political reasons. AVGO is only interested in modem and does not understand or care about the ecosystem that QCT has made to orbit around it.
Expect AVGO to stumble in mobile if the acquisition goes through. Years of SoC integration work repeated to get back to where QCA is today.