Compression Ratio

I’m asking what YOU think the benefit of running less than 9.5:1 is.

I can’t see a reason to EVER run compression that low.

Your thoughts please.
I was going by what a factory stock 318 would have for compression from the factory. I was thinking that if I was to get a car with a bone stock 318 and it ran fine and didn't smoke what performance could I expect from it with a few bolt ons. I'm taking about a LA 318. Of course if it would need a rebuild then I would raise the compression ratio.