The player using this ability perfectly understands what they are doing and assesses the risks.
Ah, but there's still not enough defense; we'll definitely break through!
Ah, what is this? There's defense here! And it's unclear whether we'll break through it on the second try or not! And we might not break through on the third try either, ugh!
I wasn't saying that a "maniac" needs 80% defense, as it's an important role. But a "checker" can definitely have it. Twenty-five percent. Or fifty, if they are strong enough.