I have a few home locations entirely with Ubiquiti equipment and a few business locations with Netgate gateways running pfSense, Netgear switching and Cisco wireless. Different networks with different purpose. None of them is running 160MHz wide channel and no business gear provider recommends it.
Mix between pfSense/OPNsense gateway with something else for switching and wireless is definitely possible and commonly used, but not needed for home network. Lower cost options like Omada and UniFi provide everything needed from a single vendor, with guaranteed compatibility and with single control panel.
You seem to know what you're talking about.