In a way I agree, but when thinking of manufacturing difficulty and complexity and value, it's the opposite. ICE OEMs outsource most everything except engines and transmissions since those components comprise the core of an ICE, are the most expensive, comprise the most guarded value, where the OEM focuses innovation, research, etc. While electric motors are important, battery systems comprise the bulk of the value and focus of innovation for an EV and are therefore a lot more valuable than a fuel tank or the fuel equivalent of the ICE. In this sense, I would argue the battery system is not a fuel tank, but equal to an ICE engine. The EV motor may be on par with a transmission.