I also semi-frequently use this tag, so clearly by practice I support it as a valid mapping. I agree with others that it fills a niche no other tag covers: leisure=playground is inappropriate for the spaces in mind, and highway=pedestrian even more so. It probably helps that such well-defined schoolyards/blacktops are common in regions I’m familiar with though (i.e. urban areas of the US).

I think leisure is probably a better key than landuse, though it’s not a particularly strong opinion. Much more important is that the current key is already in use around the world. I definitely support adding it as an iD preset as I’ve had to manually type the value in iD many times while micro-mapping schools.

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