[boredatoms]

Is this just for when applying for I-485 that you have to make a quick entry/exit trip,

or is it effective all the way back at I-140 time where people would then need to spend years away from the US?

[airstrike]

Quick exit/entry trip unless you're from one of 75 countries in which the US consulate is literally not hearing cases.

[garbawarb]

Doesn't it take a few months to process a green card application?

[airstrike]

There are many different kinds of green card and many can take much longer. Moreover, US consulates currently aren't processing them in 75 countries.