Its really not for the complex notes you would use the pencil type slates for (though it has one on the back that works kinda crappy) its for simple large font few or one word commands or messages that are high enough contrast visibility to hold up to a dive group or buddy.
Because those pesky hand signals are so confusing and hard to see from five feet distant. Much better to break out a magnetic slate to issue commands, like: stop, abort dive or share air, or one word notes like 'boat?', 'turtle!', 'fishes'.
Hard to believe one of these slates would be relegated to a closest for years. Seems like it would become an indispensable piece of kit.
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