> And all things considered, Windows is not that bad option
I'm gonna go out on a limb and say that it actually is. It's a closed source OS which includes way more functionality than you need. A purpose-built RTOS running on a microcontroller is going to provide more reliability, and if you don't hook it up to the internet it will be more secure, too. Of course, if you want you can still hook it up to the internet, but at least you're making the conscious decision to do so at that point.
Displaying something on a screen isn't very hard in an embedded environment either.
I have an open source printer which has a display, and runs on an STM32. It runs reliably, does its job well, and doesn't whine about updates or install things behind my back because it physically can't, it has no access to the internet (though I could connect it if I desired). A CNC machine is more complex and has more safety considerations, but is still in a similar class of product.
I'm gonna go out on a limb and say that it actually is. It's a closed source OS which includes way more functionality than you need. A purpose-built RTOS running on a microcontroller is going to provide more reliability, and if you don't hook it up to the internet it will be more secure, too. Of course, if you want you can still hook it up to the internet, but at least you're making the conscious decision to do so at that point.
Displaying something on a screen isn't very hard in an embedded environment either.
I have an open source printer which has a display, and runs on an STM32. It runs reliably, does its job well, and doesn't whine about updates or install things behind my back because it physically can't, it has no access to the internet (though I could connect it if I desired). A CNC machine is more complex and has more safety considerations, but is still in a similar class of product.
https://youtu.be/FxIUs-pQBjk?si=N-W-Af6jBgGBiIgl&t=46