All the power to anyone that wants to do that! My biking needs are extremely utilitarian: I have a cargo e-bike I take my kids to and from school in. I don’t trust myself with (or, rather, I know I don’t have the time to be expert at) e-bike motor installation/repair/etc and in my experience very few bike shops will want to do something like that for you given the higher risks involved. Given I’m taking my kids on the thing every day I don’t feel like taking risks either.