For example, they could have created workspaces for people to create teams and collaborate and build things, manage communities and projects have real facility to build create and run organizations with Facebook being the profile glue and communications channel.
They have had less-than-mediocre efforts on all of these. And their system stinks of every kind of digital fraud you can imagine from inflated and fake metrics across the board, to data breaches and leaks, a UX that is labrynthian etc.
With the money And resources they have, why don't we see the fruits of Vision that could be available to them.
Their cell phone was a flop, their engagements feel cancerous and they are basically a new-money-elite building moats around old-boy-exclusionist thinking.