This the 21st century. Most people have "remote-live" gear on their smartphones. One desktop in the newsroom is enough.
The problem is audience turn-over. People stay tuned for music. News gets people for "22 minutes."
One computer? You must work in a small newsroom.
Sure, you can do your field work with a smartphone. I use a smartphone for just about all of my field news gathering, production and live reporting. Sounds beautiful.
But smartphones cost money to buy and use. The good apps for live remotes (the ones in which you can even play you soundbite) cost money in either outright purchases or subscription fees for the service. Either the company incurs the cost itself, or pays the employee for use of their gear, which will include cost of data.
Sure, you can do it without buying the specialized apps. You can go live via Skype or Facetime. Still costs data on the smartphone. Who's gonna pay the bill to Verizon Wireless, or AT&T, or Sprint, etc? I'm sure somebody (the business or the employee) can write the cost off as a business expense, but someone still has to pay the bill. You'll also need a smartphone plugged into your control room. Or I guess you could tie up your one desktop computer in your newsroom.
(oh, and have fun using that smartphone on the public mobile internet to send/receive streaming audio when in a large crowd of people all using their smartphones.)
Those are expenses not incurred by your standard music station.
And while audience turnover is a reality, it's also not a horrible factor. News formats, if done right, engender the audience with assurance that they'll be there when the time comes. That "time" could also be every ten minutes on the 5's, or 8's or whatever for some sort of service element. The format thrives by people tuning back in when needed. If it couldn't thrive that way, WCBS, WINS, KYW, KNX et. al. would have abandoned the format decades ago.
True, more and more people are getting news-on-demand from other sources via mobile phones. But those established news radio stations are still commanding listeners.
A station just starting up may not have corporate backing to spend all that money on people, equipment and time to grow the product just to be able to get a 22 minute turnover.