Kubota front drive shaft oil seals

I have an L3940 Kubota front oil seals seem to be an item that several have had leaking, I did not have the time or the ability to change them myself due to age and an accident. Well I did haul it to the dealer they changed them last summer and now one is leaking quit a bit, i watched several videos and a couple had roughness or rust where the seal rides, I am thinking maybe they did not clean it up or something got stuck up in there? This tractor does not get abused at all, I use it but do not abuse it. And only have one side that leaks so Monday when i call to see when i can get it in to tell them to fix the one leaking and leave the one that is not leaking alone. My question to you guys is my thinking shouldn't these last for quite a while? or is it a design problem? To add a note i replace the utd fluid shortly after i had a leak to 80 90w. And like others have said a design problem for sure. In an application like this they should have used Timken roller bearings

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