You may be shocked to find out that many (not all!) publishers and studios treat their PR teams well, horribly. There's always been a constant struggle for communications professionals to have a seat at the table because many of them are treated like service providers and not actual business leaders or experts. Which is literally the point of their job.
Because they aren't taken seriously, executive teams think that they can do the job themselves because they've reduced the value to activities they can see rather than the judgement they can't. And often, PR isn't always influencing decisions before they're made but are responsible for cleaning up the mistakes.
If you hire a PR team to help you, listen to what they say! They partner well with community and social teams and are typically always well informed of the space because of those partnerships.