remove 5GHz suffix; the only reason to have it is because the user explicitly wants to connect to 5GHz. To have a common SSID is future proof. It will be possible to add a suffix using the gui. The troughput of 5GHz networks is also no limiting factor in most cases; 2.4GHz networks have a also a better reach. It should be the responsibility of the client to show and to let select the frequency (though this is not the reality right now in most cases).