It doesn't matter what they intended.

If I played the game the way they intended I'd be able to debuff monsters with my miner by throwing rocks.

I'm playing the game they made, man, in a way that works for me and my family and my friends. You don't have to.

You didn't answer who it hurts or how it unbalances anything. All you've done is make an assumption that SE doesn't want people doing it - and you may be correct (probably are!) but it doesn't change how the game works or the fact that no innocent bystanders were harmed in the process.