Okay. I did some more thinking and consulted some people and I think the .osu rule is unnecessary. We have existing guidelines that cover all of these issues except a couple.
Stack leniency must not be below 2, and there cannot be a 0 tickrate slider.
Is there really any other reason for this "rule" to exist other than those two things? Having super high ODs, or drain is part of the guidelines. I kind of missed the point that guidelines also cover extremities, such as things that would be unrankable. If the drain is too low, then it will render a map unable to be failed, and if it's too high it would vary. I could not say that without a doubt that a drain rate over 10 would be unplayable in every case, but really all settings should fall under the reasonably playable rule.
So I must admit that this rule is senseless. It's only there to provide an absolute limit when that absolute limit is unnecessary. If we didn't have the rule, then the process could continue normally without any need to state exactly why we need to change the .osu. So I rescind my support for the rule.