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Depending on the magic it might not make sense because people could heal everything, although you could explain it away by saying that the character could not afford a skilled healer.
I looked it up and the first known wheelchair that you could move yourself in was invented in the 1600s, which was after firearms became relatively common.
Yeah, there are some books I’ve read where their technology is clearly advanced enough for guns (ex: The Wheel of Time has advanced metalworking and fireworks, basically all you need to make a gun), but it would completely ruin all of the combat scenes and mess up the plot.