I've always considered blanking out /etc/network/interfaces to be a normal configuration. The only way to get WPA support with Network Manager is to do that.
Doing those things doesn't hurt anything if you aren't trying to do anything really weird like bridge a connection or have 2 interfaces going at once. As long as only 1 interface is going to be used at a time, wifi radar/network manager/wicd can configure it anyway.
I've always considered blanking out /etc/network/ interfaces to be a normal configuration. The only way to get WPA support with Network Manager is to do that.
Doing those things doesn't hurt anything if you aren't trying to do anything really weird like bridge a connection or have 2 interfaces going at once. As long as only 1 interface is going to be used at a time, wifi radar/network manager/wicd can configure it anyway.