We are, but it’s kind of related. It’s all about brand association and the expertise and experience of those brands.We're getting a bit off topic at the moment ???
When I think about Bosch, I think of washing machines, drills & lawnmowers, not EMTB’s
Yamaha however have a long history of designing engines, frames & suspension systems so they are the only motor manufacture (perhaps Shimano too) that I immediately associate the brand with bikes. Makes sense for the other Japanese manufactures to jump on the emtb bandwagon. The Japanese brands are highly competitive with each other and therefore always pushing for innovation, have strict quality control, can mass manufacture to bring prices down, and could easily dominate the e-bike market if they decide to dip their toes into the market