When one looks for some information, he never knows when he should stop scrolling. He may even well scroll too fast, and miss the portion he was looking for. However, when he can zoom out, he gets a glance at the page structure, can read section titles that are still legible, and directly zoom to his spot.
Exactly! Thanks for saying what I was thinking.
yes, because I can usually read the text fine, even if the site is not optimized for mobile.