Yeah zooming into pictures is nice and useful.

I just don't like having to force enlarged text size everywhere. This forces me to scroll more everywhere, with less info displayed per screen. This is also not supported in all apps.

Needless to say when you get older you may be far sighted, or near sighted.
Unfortunately, for me I'm far sighted and have trouble reading small text up close (unless I hold my phone at arms distance). I also don't want to be forced to wear glasses every time I need to look at something on my phone.

This is why I think pinch zooming within apps would be a great option for all users. I even know where it belongs, under "Settings > Accessibility > Zoom > Enable Zoom within Apps".

I really think a lot of people would find this helpful in a "pinch". Wishful thinking I guess.