So if a part on your bike breaks then you're gonna cast a new one out of raw metal? Machine it yourself? How is this different than any other part you have to r

So if a part on your bike breaks then you're gonna cast a new one out of raw metal? Machine it yourself? How is this different than any other part you have to replace? It's an electric motor, a battery and a cellphone in a red plastic shell. Nothing to get religious about.