[gdubs]

So if, say, an older user forces all text to be large and it renders a site unreadable, you would blame the user?

[eps]

Why would an older user want to enlarge text only, and not the images and other page elements? He wouldn't. He would be using either Ctrl-+ in the browser or an OS-level zoom.

[vsl]

The first thing I enable in Safari is View->Zoom Text Only. Just because you prefer whole-page zoom doesn't mean the rest of us does too. I use zooming only when a page has unreadably small text size, in which case I enlarge it to be readable and do not want to scale up and uglify images that are usually perfectly fine in their original size.