Hotel safe might, if it logs somewhere (serial port?).
The others may have a serial port setup during development, too. If you have a truly small formatter, you can just disable it for final builds (or leave it on, asssuming output is non blocking, if someone finds the serial pins, great for them), rather than having larger rom for development and smaller for production.
mostly used for debugging with "printf debugging" - either on the developers desk, or in the field ("we've got a dead one. Can you hook up this pin to a USB-serial converter and tell me what it's saying?")
The others may have a serial port setup during development, too. If you have a truly small formatter, you can just disable it for final builds (or leave it on, asssuming output is non blocking, if someone finds the serial pins, great for them), rather than having larger rom for development and smaller for production.