Other times we see another hacker using a better tool and realize ... say you upgrade to a Due or Teensy for more code or memory space, the Arduino IDE can hamper your productivity.

private: Program() { } void checkSerialInput ... I can’t possibly hack the entire Arduino code but using the Sparkfun code provides a manageable subset for experimenting.

The libraries even come with example codes for your convenience. On the other hand, to program hardware ... sensible choice ...