New Shimano EP5 and E5100 motors revealed

Will this one have the ability to be serviced by third parties, or another one to avoid with a limited warranty?

Servicing is getting worse. Both Bosch and Shimano now use better encryption on the electronics and neither have any spare parts available (Bosch used to have a service kit for the gen 2 motors). If you open them and damage any electronics you need a new motor which is around 1k and it could take anywhere from a few days to a couple of months. Sometimes you get some goodwill from the manufacturer but it seems to be pot luck.

It'll be interesting to see if the upcoming EU laws around repairability of electrical goods make any difference to ebike motors. Not that we'd directly benefit due to Brexit but in April the EU voted to enshrine a Right To Repair in EU law for primarily household goods like dishwashers etc although smart phones are included and the list can be expanded. Ebike motors feel exactly like the kind of thing that should fall under this. Force the manufacturers to make them repairable rather than having to be replaced

https://www.europarl.europa.eu/news/en/press-room/20240419IPR20590/right-to-repair-making-repair-easier-and-more-appealing-to-consumers