I think it’s the other way around. I think it’s because they have a Reset to factory Settings Tool, that they don’t have to be concerned making the wireless Firmware update robust.
Also, I wonder what Oticon/Signia will recommend for a scenario where you get a failed wired Firmware update because you lose electrical power during the wired Firmware update?
ETA> The manual for Oticon Firmware Updater Tool only says restart if it fails.