>I love how confidently you say this,

it's not that difficult to say it confidently if you use any of their services and applications because exactly nothing has changed.

For reference most labor productivity increases for the last 50 years amounted to about 2% per year. If a hypothetical FB engineer had doubled their productivity with their gazillion tokens that would be 30 years of productivity gains in one year. I'd wager the evidence would be quite evident if you opened any of their apps