Real real time people use an MCU with no interrupts at all, and every process running in its own processor core .Real, Real time people use the ARMxR, not ARMxA(Pi) or ARMxM(micro).
Linux is useful in the post MS era.
Keeping the code/data/docs on an external USB stick, means the SD card just holds the OS.
Easy then to swap OS.
I am a worse demonstrator/lecturer than I am an author. There is a reason I have turned down every professorship that has been offered me.Lots of pictures and code or do what they do these days, YouTube videos.
My kid learns more minecraft tricks from youtube than doing it himself or reading the books..
Though I can definitely write a book, however small. I will have the time to be complete while away from everything.
Those small screens take more power than most realize. Small LCD/OLED displays are much more efficient.Mains voltage stuff is not as important as it used to be with the fridge the number one issue as it runs 24/7.
Things like TV are multi voltage and getting more efficient, soon 12V OLED roll up stick on wall?
Not that TV is a big as it used to be with small screens and phone/tablets potentially in every room.
As for the fridge, it is not as big of a thing as most make of it. All you need is a very well insulated top opening cooler that uses a peltier junction pile to cool. If you keep it full of stuff well packed it will keep itself cool for long periods, and with it being top opening there is less loss when you need to get into it. Ends up actually running about 20 minutes per day, sometimes as much as 45 minutes.
Cooking is an easy one, there are many alternative ways to cook that cost near nothing, or nothing.Utilities are a big problem, too expensive for most people to replace.
Cooking and aircon really the major problem we have here.
Peak demand brownouts have even got the politicians talking big project again.
As for Air Conditioning, in that climate, build underground dugouts. That takes care of 98% of your climate control needs.
As to the rest:
If you give a problem to the politicians to solve they will create a 'solution' that costs billions, and in the end makes the problem worse.
If you give the same problem to a quiet thinker he will provide you with a solution that costs nearly nothing and solves the problem, though the politicians will never go for.