Got to ask pale rider, since you brought it up again.
Do you never check/service your wheel bearings (dynamo or not)?
Check - occasionally, service - never.
I tend to buy quality kit, and don't do enough miles to wear out bearings.
My main ebike has a Rohloff at the back, so no worries there.
The front is a sus fork through axle, not sure of the bearing make.
If that ever wears out it will be a bike shop job.
As a general point, the bike is a Riese and Muller, which does seem to be built with longevity, rather than low weight, in mind.
My caravan bike has 20" wheels with derailer gears and a rigid fork.
That's done a few thousand miles with no sign of wear, and probably only does a few hundred a year.
In this thread we were talking about dynohub bearings.
Do they ever wear out?
I had a Shimano dynohub which did 5,000 miles before I sold the bike.
No wear on that when I last checked, so I can't see it failing anytime soon.