Form 8606 - A few questions

We have been collecting and saving our 8606s for multiple years.

 

The only time i have seen some benefits is hen doing Roth conversions, TurboTax calculates an amount not taxable, and reduces the total basis by that amount.

 

How else do those numbers help? I asked my advisor that when RMDs are due, does the basis help and he said no.

So where else do I have benefit of the taxable basis dollars for my wife and I as we have separate amounts

 

Is there  YouTube or podcast anyone can recommend?

 

Thanks