I really want a smartwatch with proper always on screen (so memory LCD, like those COROS ones), but I also need LTE so I don't have to bring my phone on short e

I really want a smartwatch with proper always on screen (so memory LCD, like those COROS ones), but I also need LTE so I don't have to bring my phone on short errands. Unfortunately no such product currently exists for some reason. The Apples, Galaxies and Pixels offer always-on, but they dim down a lot in order to not drain the power, which kind of defeats the purpose. A memory LCD screen on one of these watches would be perfect for me.