Why are global variables bad, in a single threaded, non-os, embedded application

Question

Most of the objections I see to using global variables make sense since they refer to issues of multiple threads, thread safety, etc.

But in a small, single threaded

Answer 1

Code which uses global variables is harder to maintain. Since the maintainer must find every use of thevariable in the system before she can know precisely what the variable does. Since this slows maintainence it should be avoided as much as possible. That's it `