Clean Slate Glitch?

Ah, I see. Now you have somewhat convinced me that it is a glitch, simply by pointing out where it was not intended. However, by your logic:

I can call HP Washing is a glitch, simply because they did not address it at all. They did not say anywhere on the AP Resets that by putting in HP, you could pull out MP and vice versa. They simply left it in as a feature.

In a similar way, the white scroll does not say that it is limited to usage only with normal or dark scrolls. It merely mentions the two.

I'd sooner agree with you that the HP Washing is a glitch than the scrolling is intentional, because it's abnormal that of all stats, only HP and MP would be conjoined in such a way that tampering with one lets you modify both/either. Could easily settle it by asking NXProse whether or not it's functioning as designed or being exploited in his next open Q&A, or even submit a ticket really.

As for the not addressing bit - It's already been pointed out that these scrolls come from versions of MS where the other piece didn't exist. Their original creators wouldn't have made provisions for something that wasn't possible in thier native environment. Just as GMS says every time they do a patch "New content has to mesh well with our version, and since we have unique content, there's always a possibility that it could affect another area of the game, so we have to test it". This meets all the criteria for being one of those things they failed to test - disparate content interaction.

This too can be addressed via ticket or posing a question.

Tangential to the topic overall, not Harry - It's rather ridiculous for the community overall to bicker internally over something none of us has final say over the legitimacy of, especially to the degree some people are.