Because you or I or someone like us tells them they should for a new feature. Or they're fastidious. Or they feel like they'll screw something up if they don't. Or they do so in hopes of improving a poor experience. Or they pay attention to and trust their vendor's marketing. Or they take it in for service and its done for them. But for the most part it really doesn't mean anything to the common customer.
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So why are they updating at all then? If they don't expect any change (either positive or negative) why are they doing it?
Because you or I or someone like us tells them they should for a new feature. Or they're fastidious. Or they feel like they'll screw something up if they don't. Or they do so in hopes of improving a poor experience. Or they pay attention to and trust their vendor's marketing. Or they take it in for service and its done for them. But for the most part it really doesn't mean anything to the common customer.