> Because in some sense academia is the real world.

The old one; what's the difference between academia and the real world?

In academia, there is no difference.

Proper grammar on formulaic language is a proof-of-work system. Difficult to achieve but easy to check. It suggests that the author cared enough to put in the time. When the cost of graduate labor is low, careful editing suggests that you can burn a student's time to demonstrate the message is worth reading.

> Because in some sense academia is the real world

Isn't at all, it's a completely different system that exists beside the real world with different incentive and reward systems.