I actually wrote something on that regard that I didn't post, but the summary is this.
To me, I've always viewed Destiny's marketing from 2 perspectives, which is pre-2014, and post-2013.
We all know how Destiny's marketing started out. A lot of big promises, concept arts, names being dropped down. Then later at the year we saw the gameplay slice, with public quest, etc being showcased for the first time.
But what happened after that?
Destiny's marketing post E3-2013 significantly winded down as they kept quiet from a marketing perspective for months on end, only getting very sporadic updates. And even when the marketing engine revved back up in early 2014, it was very apparent that there's been a shift in their marketing and messaging, where they've avoided mentioning places like Old Chicago and Mumbai Push, but instead laser focused on Old Russia, Moon, etc. I recall there being an interview where Bungie was asked if there was any other explorable space on Earth other than Old Russia, and they deflected to answer it by saying that they're focused on Old Russia right now or something along those lines.
I don't know if it was developmental troubles or rather their original vision being unachieavable by September for whatever reason, it was starkly apparent, imo, that never mind content, even from a gameplay perspective they were unable to deliver their original E3 2013 gameplay promise, with real-time ship teleport to world and ghost lighting being removed from the final retail release.
That's why I was initially even questioning whether or nor our Guardian would be a mute character, because all the trailers post-E3 2013 didn't show our character talking at all. When the E3 2013 trailer was cited as an example for that, I said that that old trailer is pretty much bullshit at this point, because it's clear that there are things that at a fundamental level that has changed from then to now.
Kinda like Bioshock Infinite. I could reference back all the promised stuff showed at the old trailers/interview, but it's clear that things had changed since the original reveals. The same is true for Destiny at a lesser scale.