Battery life, sure, but functionality, nah. Apple is all about appearances, and a black/white screen running at 1fps isn't a good appearance.
Honestly even I wouldn't want an e-ink watch when there are other watches out there that get good battery life and have so much more functionality. My OnePlus Watch 2 gets me a few days. I only charge it when I shower and basically never have to worry about battery even on my frequent weekend camping trips.