I have two Bosch powered e-bikes (gazelle Modeo and Turn GSD) and one DJI Avinox (Amflow PL carbon)
A few years between each bike and very different bikes. But Avinox feels like it has come from nowhere to be on par or superior to Bosch. The charging plug egonicis is 100x better too.
Shimano is famously a company that people in about four seemingly random/unrelated fields/hobbies think of as a specialist brand in that hobby (e.g. fishing).
(They are or at least were originally a bearings company, specialising in things that need to spin with very low friction, and all their seemingly unrelated businesses started from that)
I don't know about the other industries, but within old cycling circles they're also just seen as the group that was first to make good counterfeit goods that were actually high enough quality to use, and their entrance to the market was aided by the fact that existing players, campagnolo and schwinn mostly, were producing junk from junk proprietary alloys in order to compete with 'overseas' components at truly exorbitant costs.
that was 40-50 years ago, so who cares, but Shimano is truly interesting for cultivating so many different opinions.
Which feels weird when you consider the pedigree of shimano, but it makes sense when you think what kind of internals an ebike motor would need.. I guess.