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I may want to zoom to see an image up close, or just to change text size. Outside apple, phone screens vary widely, and so do text sizes. You can't hope to find one that works on all phones for everyone.

Because on a small screen the size vs data density tradeoff has a sweet spot that varies from one pair of eyeballs to the next.

Yeah, that's true. But are we talking eyeballs within the same age group, or like teens vs. old people?

In my experience, it varies both within age groups and between age groups.

Some people don't have as good of eyesight as others. Let them adjust the site to fit what they like.