Continuing ignition timing debate from the 416 thread.

TT5.9mag said

I look at it like this, instead of thinking about how much power was gained by accessing the 1-2-3%, what happens at peak torque on something with a very narrow tuning window (pump gas, boost, cast iron heads for example) and you’re 1-2-3% wrong in the other direction? That goes badly very quick and it pays to get it right.

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I don't think anyone is suggesting that you should intentionally over time an engine. But rather you may give up a tiny percentage by having it under timed in an area. To avoid the exta cost of building a custom curve for that tiny percentage left on the table. Not saying that is how I would do it for myself but for some of my customers that is the option they would choose.