Earlier quoted context omitted.
I don't think eink makes much sense on a phone especially if your phone is also your camera. Even if you aren't using it as a camera, eink displays aren't great for content that needs to be updated frequently. Aside from the slow refresh, they physically wear out relatively quickly.
They do? My 7 year old kindle still seems to work just fine
If you are using it as a primary display on a phone showing dynamic content, you are going to be refreshing it as quickly as you can the entire time you are using it. I think modern low end panels can maintain about 7 fps or a refresh every 0.15 seconds. That's a two order of magnitude difference.