I bought the LCD without and later switched to oled with. Honestly. I barely notice it. Go for the cheapest oled option. That is a change you will notice, unlike the the etching.

Well. Let’s see how that turns out.

Similar theme to open tofu. https://openbao.org/

Yes. They are using WebUSB. That’s only supported on chrome browsers for now. But it also works on Linux. The home automation community makes great use of that api.