Because he can not endorse people hacking the game since it's against the ToS. Believe me when I say that any time "you" as the official word of god on some project says something that gets misinterpreted, can be the difference of millions of dollars in lawsuits from people getting their account terminated because they thought Yoshi-P was secretly approving something. In customer service, if you can't find it in the ToS, it doesn't exist, the customer is wrong or right entirely by how it is worded.
Much like other MMORPG games, if you use tools on the game, don't ever mention the name of the tools, the websites they are available on, or post any screenshots or video to youtube with such tools running otherwise you're on a one-way trip to ban-town. Have you noticed how many times "temporary ban" shows up in the ban reports?
http://na.finalfantasyxiv.com/lodest...9e80c6b37a8c65