They Don’t Install Updates
It can be incredibly tempting to just keep ignoring those iOS update prompts. And to be fair, updating your iPhone can take some time. But installing iOS updates as they come out, in general, is highly recommended.
Even if they don’t have any shiny new features, the vast majority of iOS updates contain critical security fixes that keep your device from being hacked or your data from being compromised.
More than that, iOS updates regularly feature bug fixes that help your iPhone run smoothly. In other words, you don’t have many reasons not to update.