In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:

A pull-up resistor costs all of 2-cents (USD).  

If somebody decided to "manually" reset the SX by taking the pin Low without there being a pull-up resistor ("Yeah, Dick, just short /MCLR to ground..." --Pop!--), then he'd short supply to Ground.

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