I generally don't upgrade hardware if what I own still works well enough and meets my needs. If something breaks, sure. Likewise if it is substantially easier or less expensive to buy something new rather than upgrade something piecemeal.
This might sound inflammatory, but I think it's wasteful to buy the latest model of something just because it's new, if what you currently own suits your needs. Spending money like that stimulates the overall economy but it's not so good for your personal finances and probably not good for the environment either.
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