It's been here ever since the beginning of the game, and serves only a few reasons: To kickstart the beginning of the game and provide 2 extra vendors so that we may fast travel here to check out the garbage vendor resets every week. It's a big plot of land that is treated as a social area and has a beautiful scenery, it's a shame that it's been put to waste.

Can we get some ideas in here? Personally, I am pretty shocked that item sharing/trading isn't really functional in this game, wouldn't it be great if any item under your inventory could be shared with any player you choose? (I can see this being an issue of sorts, or possibly even abused, but there's always time to work on it right?) So make the Hub a trading post where players could come here to swap items/exchange gear and maybe even pouch resources such as crafting materials, keys, currency, etc.

Edit: Pretty much an outdoor terminal wouldn't be too bad of an idea. Have all the calibration stations/crafting stations, HVT officers, shooting ranges, market place for trading/buying/selling items to other agents, special Search & Destroy missions, etc.