When using a simple OTO test kit with low levels (10ppm) of CYA in the water, is the chlorine that is being 'buffered' by the CYA detected by the OTO kit?

The reason I ask is that I've just refilled our 15,000 gallon IG concrete pool and now have perfect water as a starting point. I'd like to keep this simple and use the pucks in the auto-chlorinator, setting it to give me about 2ppm per the OTO test kit, then use bleach to adjust after certain events, like a big pool party.

But reading the Best Guess CYA chart leads me to believe that the more CYA I add, the more chlorine I need, well above the 3ppm at the top of the OTO kit. Currently, with 10ppm CYA (calculated by weight of chemical added) the chlorine seems to be holding throughout the day. Why do I want to add more CYA (30-40ppm recommended) when that just means I have to add more chlorine? And if I turn up the auto-chlorinator, the pucks will add more CYA too, which means more chlorine. This seems like a death-spiral.

Why not run the pool with very low CYA if it is able to hold the chlorine?

Thanks,

TW