Keep in mind, stations and local cable companies are run by business people, so the less money they have to spend to get advertisers on the air the happier they are. Quality does not become an issue until they start losing revenue because of it.
By only accepting a couple of formats, they are in essence streamlining the delivery process for themselves. A tape comes in, the encoding person pops it a deck and it’s done. Routing multiple decks and pulling files down from FTP sites slow down the process and have the potential for errors. And business people don’t want to give clients a ton of “make good” spots because the fields were inverted when the spot was pulled down. The encoding guy where I work on a busy day has about 120 spots that have to be encoded so there’s no time for errors or guessing.
A lot of that will be changing as we are slowly preparing to go with a tapeless delivery system but at the moment when we receive files via FTP or on a disk they are all converted to Beta tape and then encoded.
The P2 situation is funny but it’s most likely caused by the fact that the encoding stations don’t talk to the edit stations. If they did accept P2 delivery at the moment it would just get dubbed to a tape and then encoded which just makes extra work for someone (sometimes me) and slows down the process.
Of course all of this is changing fast and a month from now my answer could be different.