I assume it is since it'd allow you to "rush" maps without playing at all. Having a rule to say "You need to play" is vague, to ban NF is easier and works properly.

but you need to FC maps, not clear them

Remyria: Oh right, now that you mention it.. well, like Awsumi said but there won't be any difference if it's allowed or not.

it's possible to keep an fc on the map and still fail depending on how bad your acc/hd drain is