Really who cares?
I like the fact of an external PSU. Look at the ps3's size what would you wrather try to make room for an over sized console or power supply? it adds an edge in replacement also if the event ever comes up. As for wireless.... it complies with FCC rules and the other hardware may not. Also you have to take into effect most of the systems that are wireless have channels that can be switched.
The idea of simple household things like cordless phones can have this issue is being a bit parrinoid. cordless phones from 900mhz to 5.8ghz can switch channels same with wireless routers.I have wireless keyboard/ mouse, remotes, wireless xbox controllers, wireless router, psp, cordless phone. almost everything opperates at a 2.4ghz yet i have not once seen an issue. I have seen ps fans accuse xbox360 wireless of stealing bluetooth from this as well..... its wifi.