I take it does everything you need today.
Here I see the numbers with 2.1 billion in smart phones alone so without adding in all the others your question seems to be, well, are you bordering on being Chicken Little?
There are many other systems like the Pi and the problem is they are not as useful to most like your average phone or PC.
But let's go with this. Embedded computing platforms which are too many for me to list do what you ask.
Does anyone have a list of computers with no writable firmware..?
If you get hacked, hackers can deeply infect the BIOS, GPU, WiFi and other components that "hold state".
Then, even if you wipe your hard drive after getting infected, you can still just get re-infected again, due to the deep firmware infections.
The Raspberry Pi is an example of a device that does not "hold state".
Every component on the Raspberry Pi has its firmware and drivers loaded in from an SD card.
Thus, if you wipe the SD card, you have truly wiped the device, and can be sure that it is totally clean.
Does anyone have a list of similar devices to the Pi, that do not "hold state" on ANY of the components...?