Costing under $100 and needing to be charged no more than every two weeks is an absolute killer app[liance?] for me. I have enough random crap needing constant charging or awaiting expensive replacement. So that's why my watch is a Timex (in low-enough light conditions its Indiglo backlight doubles as a flashlight. A flashlight!!) and my ebook reader is an e-ink device rather than a phone or tablet.
Come to think of it, having an LED screen of any kind is a big red flag where one doesn't have to exist. It's as true for guitar pedals as it for wristwatches - just one more thing that can break and may as well brick your device when it breaks unless your repair game and supply chain is strong.