Because otherwise people will never run the updates. If left to their own devices, the average computer use will assume they’re fine because updates are an incredibly opaque and abstract subject. Those leaves those users open to security vulnerabilities and delays the adoption of new features.
Some people assume they don’t need the updates because they don’t visit certain types of website, or because they don’t engage in whatever risky activity, while other people assume that what they have now is good enough and running updates is just going to interrupt their flow.
In short: people are lazy, and wildly overestimate their current level of safety while wildly underestimating their risk.
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