"Always replace your cassette and chain at the same time."
Ideally you should replace your chain before it's worn out your cassette's and chainrings' teeth. That way you can get through several (cheap) chains before you need to replace the (more expensive) cassette and chainrings.
Yeah I always push replacing chains before they wear out. Depending on the miles I ride. I change mine out about every 8 months. It's like the old oil change mantra. Oil changes are cheap. Engines aren't.
I think what others were mentioning is that if you change out your chain before it mucks up your cassette, you won't hardly have to change it ( unless for aforementioned weight or 'bling factor' or something)
I run my cassettes for years and my chains for months - no problems
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