> I sure miss the "good old days" when you just focused on writing a single app in C that ran on a well-understood machine, or even a single well-understood OS

> I sure miss the "good old days" when you just focused on writing a single app in C that ran on a well-understood machine, or even a single well-understood OS API. No, those days are alive and well in the embedded/IoT world. I suggest you look into doing some embedded work, if you want to return to that style of development ..