I agree, and most you tubers just plunk their camera in front of them and talk or do mundane things for those 20 minutes, with a bit of graphics and some clips interspersed. IMO Gabby crafted an 8 minute music video/love poem, something from her heart, not just 'content'.
IMO discussing the social media is only relevant because it was produced just before she died, so it does reflect her state of mind (ie not wanting to break up with Brian, her visions for her future), and secondly, IMO it's a big reason why her case captured so much attention. On the one hand there's her social media, on the other there's the Moab video and her disappearance/death, and the two do not align at all.