Xt, Slx 12 speed rear deraileurs not very strong.

[Alouette3]

QUESTION - in the photo above there are bearings visible .... I do want to grease these, yet the videos, and the manual loaded earlier in this thread, warns against this .... would love to hear from the experts why ?  Surely the idea of these bearings is for low friction movement, which typically involves grease ....

Not a normal bearing, that is a one way bearing, allows for rotation in one direction and locks up in the other allowing the friction clutch to do it thing.

 

A light oiling might do it good, don't wanted it packed with thick grease blocking its action.