Ok but what about failed testing? If a dclass gets let out as 008 isn’t it still failrp cuz it’s technically breaching it
Nope. That's just a research test gone wrong.
Rules are built to make the server more fun. The reason it doesn't come into play currently is because, well, it's not allowed. Of course it's never going to come into play. Now, if it were allowed, it'd have a low success rate. But, that wouldn't matter, because then D-Class riots would prioritize learning about 008 IC and breaching it. Suddenly, you'd have 008 breaches every couple days due to D-Class.
It'd also remove what's special about 008 to remove that rule. It's so rare right now, that when it DOES happen, it's actually scary. Imagine if this rule was changed. SCP-008 breaches would go from something everyone respected due to how rare it happens, to hating it. 008 would almost certainly get nerfs, which I think would kind of suck.