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Because eink panels are expensive.
The cost of such a screen, with case, memory, CPU, radios etc would be the same as any eink 10" ereader.
It's a tiny niche market to have a monochrome screen. No-one does a monochrome LCD even though it would have better contrast, better viewing angle be able to have a reflective mode, have higher resolution and save maybe 3/4 of the backlight power.
Also an ereader is low power because you are mostly reading a page. Typing on it is massively more power consumption and might even be nearly as high as a same resolution mono LCD!
Bluetooth and especially WiFi radios use a lot of power; that's why Bluetooth annoyingly goes to sleep and loses characters. A dedicated wireless keyboard with USB dongle works far better on my Android tablet. A USB keyboard is better still.
The Kindle is sold near cost. A 10" screen eink as you describe would be at least twice the price of a Kindle Paperwhite.
There are some ereaders that can be used as monitors. They are expensive. They'd be no cheaper if they were not ereaders.
The 5G is overhyped. In most cases and places it will not be any different to 3G or 4G. The really fast modes are like the 5.8GHz WiFi, or worse coverage.
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