Why not?
Personal negotiating preference but I always start with just payment and DAS (and any incentives you qualify for). No sense getting into the weeds with a sales rep who most likely has no idea about detailed lease terms or MF’s, etc.
Of course I’ve done all my homework beforehand and know exactly what my target payment/DAS is based on given the MSRP/discount/term/MF/incentives/fees/taxes.
“If you can do $750/mo with $1k total DAS including tax I can be there by 5pm tonight to sign”