Re: sealed gimbal bearing
My "opinion" is that sealed bearings are used in so many things today to take the maintenance responsibility away from the consumer. This has an advantage only for consumers who only maintain things after they break. The down side to this is that sealed bearings may not last as long as properly maintained greasable bearings.
From an engineering standpoint it has the advantage of a more predictable time until failure. Good for warranties and scheduling maintenance intervals. Of course the maintenance is to replace the bearing in this case.
Other examples of sealed bearings replacing greasable, Wheel bearings in cars, spindles on riding mower decks. I'm sure there are plenty more examples.
Again note that this is only my opinion
