I guess you are right, but my old tractor did not have a grease fitting on joint. So the only way I could think of to lube the bearing was the spray graphite. So far it works ok and does not collect dirt.
a few years later model, but still a MF that looks like the TO. Fergy installed grease zerks on the lift arm cross shaft under the back of the seat. I guess if you do not grease it much you would be ok, but if you grease it too much the grease falls down into the hyd/trans gear case cavity, do not know what that grease would do for the hyd system. guess they stopped that after a few years.