Chain and sprocket wear is an old chestnut which crops up time after time.
For me, the pivotal thing is convenience. I use a Rohloff gauge which is one of the ones you just drop onto the chain, its a "pass/fail" gauge, it either drops down or it doesn't.
I accept that it "fails" chains before it really needs to do so, because it includes roller wear.
However, because I can just drop it onto the chain and get a reading, I check the chain regularly through the winter, in the freezing shed in poor light.
If I had to clean the chain, or put the bike on the stand, or arrange some lighting so that I can see properly, in order to measure the wear "accurately" then I wouldn't check the chain anything like as often, and that could wreck the drivetrain.
Have a look here at a cassette which lasted......
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