Your own phone, your own connection, and your own familiarity with the site all make problems invisible that a genuine first-time visitor would hit immediately.
Your own phone, your own connection, and your own deep familiarity with the site all make problems invisible that a genuine first-time visitor, on a different device and a worse connection, would hit immediately and directly.
A layout that looks fine on your specific phone model may break, overlap, or render awkwardly on a different screen size or older device — testing on one device tells you almost nothing about the range of devices real visitors actually use.
Your own connection, especially on home wifi, is often faster and more stable than what many visitors experience on mobile data in real-world conditions — a page that feels acceptably fast to you may be genuinely frustrating elsewhere.
You know where every button is, what every label means, and how the site is structured — a first-time visitor has none of that context, and friction invisible to you because of familiarity is often immediately obvious to them.
Testing on multiple real devices, under throttled or realistic mobile connection speeds, and ideally with someone genuinely unfamiliar with the site, surfaces the problems your own comfortable, familiar testing conditions simply can't reveal.
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