Facts, started playing this game on my PS4 and had to kill a part of my soul each day.
I'm just going to continue on my rant right now.
Destiny is so different for so many reasons. The major reason is that Activision needed to make money off of Destiny, as in set-records kind of money. Destiny was designed with major content, it's so obvious. Destiny most likely had a dramatically deeper, more engaging, and more interesting story. It is evident in how an OFFICIAL TRAILER, one of the first trailers ever of the game, had a short cutscene that includes an NPC in an entirely different place from the story (I forgot where, but I'll show). Activision, however, wanted the game to be one that simple teenagers could like. The story requires little thinking. And what the hell is the point of Sparrows? So you can get to a mission 2 seconds before the rest of your Fireteam? No. I believe that Sparrows had a racing related purpose where kids could buy. Also, why the hell can't you trade items? In one of the earliest developer commentaries, a developer said that you could "gamble and trade" items.
Why is all of this there? Because Activision wanted to dumb down the game to appeal to all audiences. Think about it, the game is so autonomous and repetitive even a 10 year old could play it. If the game had a trading system and economy, then it would suck for the kids, because most likely the older players would be able to outsmart and scam the kids. The story would be boring and difficult to understand for little kids.
Destiny was made for kids.