Peterh337 - it sounds as if you've been very unlucky with your maintenance choices! I've been an aircraft engineer for well over 30 years and never worked for an organisation that didn't clean bearings and lubrication points on a servicing check of any level. If they were called up on the approved factory or maintenance schedule, they were complied with.
Almost all external and internal bearings are sealed nowadays (excluding the likes of the antiquated BN Islander flap, rudder and trim jack ball ends) and I don't really see the advantage in covering them with grease, especially considering that Aeroshell 7 is quite hygroscopic. Likewise with light aircraft wheels - I've seen literally hundreds corroded in the bearing boss circlip area because the felt seals are treated with grease, which absorbs moisture (and there's obviously plenty of that due to landing and taxying in wet conditions). A very light soaking in Fluid 3 general purpose oil puts a stop to that.
Re non-exposed linkage bearings, I'b be very surprised to see the grease lasting more than a hundred hours on the actual contact areas, never mind two years. More cosmetic than anything else in my opinion. It would be interesting to see other viewpoints, such as from A&C.
Anyway, apologies to the originator for going off track.