That’s a press release writing best practice. Your goal is to match the journalistic writing style as closely as possible, all the while still transporting all the messages you want to transport. Make it easy for the journalist to be lazy. It has been this way since basically forever because PR writers know that journalists are under a lot of time pressure and often don’t even have the resources to write everything from scratch. So you offer them something that’s hard to resist …
I guess the web has sort of muddied the waters there (with companies being able to publish press releases on their own websites) but the intended target audience of press releases are actually journalists. In the past companies usually had no way of publishing and distributing news about themselves on their own. (And, to be honest, press releases on their own website still aren’t the best publishing platform.)