That's what I do, I trust the chip to sort things out.
When I build a coil, or use a stock coil, I have a rough idea what power it needs. I start low and up the power until I get a nice vape then Replay it. It doesn't matter to me if Steam Engine says it needs 85 watts, i'll run it at 60 watts if it vapes fine, or go past 85 watts if needed.
I guess it could drive you nuts if your the type that needs to know exactly how something works.