Your stance makes no sense. What benefit do they have to essentially lie and claim they never intended parties to rely on tank LB3 to cheese the mechanic if they actually expected people would? Tank LB3 simply gives 80% mitigation party wide, which omits virtually all of Hakutei's damage as it's entirely based on percentage.
Who says they need a "benefit"?

Bottom line is, if it were truly unintended, they would fix it. They haven't. I don't know about you guys, but for me, actions speak louder than words.

For another, they tend to get mad when people don’t do the content as they designed for it to be done.
Precisely. And they aren't getting "mad" about it here. What does THAT tell you?