It isn't yet, as EV battery technology is compared to ICE relatively new. Get the design right and it can become proper plug and play at a reasonable cost. No getting yourself worked up about itNot really. More that some people seem to think that EVs have solved inherent ICE issues and then come out with stuff like 'all you need to do to get the range and performance back to how it was when it was new is fit a new battery'.
That isn't a Haynes one spanner level of job, nor is it a cheap one. It's at least on par with replacing an engine in an ICE car. What do you think that does to it's performance and economy?