If you simply unplug a RPi without shutting it down properly there is a chance that the SD card will get corrupted. It is possible to 'harden' the system by mounting the SD card read only, but that is a faff to set up and I've still had corrupted cards. This makes the RPi not useful for kiosk type applications.

Contrast with Arduino, where I plug it into my laptop and upload some code, thereafter I can plug it in/out/'turn it all about' with power and it reliably does 'stuff'