Same with all games really. GTA5 facebook page is a classic example. There isn't any content locked behind DLC and it isn't pay to win(although the economy is questionable) and people will still complain, despite most vehicles on peoples wishlists ending up on the game at some point or another.
The issue I see with a social media manager for PD is that unless they are empowered to ask people for feedback then I don't see it being particularly valuable to the player base - unless PD are more open about upcoming content.
Where did you read this? I am curious.
The issue I have with tuning is that the descriptions for adjustments and their expected effects could be communicated better.
I've felt historically that GT has been pretty poor in describing what each component adjustment actually does, and then critically linking that description to the numbers in front of the player. GT Sport is an improvement on previous games in this regard, but it could be better.
Some settings also don't make sense, like rear bias brakes making the Huracan Gr4 understeer.
The biggest issue for tuning is that GT needs to, and does, appeal to people who want to pick up and play. Project Cars doesn't, and sales suffer as a result.