With thanks to @BJT2 for going to the hard work of compiling this list, the ABC currently (or has recently) produces at least 14 regular, nationally screened programs produced in Melbourne compared to 19 in Sydney.
Not including local news, state based travel shows such as Sydney Weekender/Postcards and shorter form programming (telemovies, mini-series, documentaries, etc.), the scorecard for our other networks…
Seven: 6 productions in Melbourne, compared to 19 in Sydney.
Nine: 7 productions in Melbourne, compared to 20 in Sydney.
Ten: 8 productions in Melbourne, compared to 17 in Sydney.
SBS: 0 productions in Melbourne, compared to 10 in Sydney…although probably more once NITV programming is taken into consideration.
So while all TV networks have Sydney as their main production centre (especially in the area of News & Current Affairs - but no credible Australian broadcaster can’t have a decent N&CA base in Sydney), the ABC has more Melbourne-based productions than the others. One would imagine that it’s a similar story with radio.
Don’t know about the other states, but I’d imagine that the ABC has at least one or two nationally broadcast programs produced in at least the BAPH states, while the commercials & SBS have pretty much nothing apart from news stories which sometimes make it onto the national or Sydney/Melbourne-based bulletins. Even then, “Sydney-fication” of interstate news (Sydney-based reporters repackaging interstate stories for us) is a relatively common practice particularly on Seven & Nine.
Either way, I’d personally prefer to have decent quality programs that are worth watching, no matter where they’re produced. The fact Married At First Sight and The Bachelor/ette are made in Sydney won’t stop me from thinking they’re some of the most toxic programs on Australian television.