I would claim that something 50% of the application developers writing code for Nokia (internal or contractors) could not handle strings correctly. It was in theory C++ code, but because compilers were not very good at the time when EPOC32 was developed and memory was pretty limited there were special implementations to work around all the limitations. Programming was not easy, productivity was low, and buggy application code was the norm.

I vaguely remember in the very late days there might have been some simplifications, but the train had gone already at that time.