The letter aims to maintain the status quo of the project of the Church.
The world is shifting under the Vatican's feet and the crappy system they once lorded over is done.
It's time for change, maybe people don't need to work anymore and maybe people should aim to reengineer humanity and eliminate illness, old age, suffering and vulnerability. We can fundamentally change how society distributes wealth.
Some of the arguments are rich coming from the Church: being scolded about centralization of power, claiming truth and shared information is a common good, and consider the history of the Church in their anti-war declarations.
The most astonishing thing in this letter is the pope declaring that modern technology has rendered Aquinas's just-war theory out of date.