I agree. Tesla regularly used EoQ incentives to drive demand pre-2020 including Free supercharging (Unlimited, 2 years, 1 year, 6 mo.), Free option upgrades (Paint, wheels), and Free FSD (1 mo. trial).This is a great idea.
If this tax incentive passed there would be lots of people holding off on Q4 delivery and Tesla would have to do something to prevent that. They could drop the price and raise it again in Q1 but that would complicate things re: messaging about supply constraints causing price increases, media criticizing Tesla for demand issues (because nuance and context do not exist for them), criticism when prices are raised again (accusing Tesla of trying to capture tax incentives).
I think including FSD for free (maybe for a year- $2388 @ $199/mo.) would be a great way to gather even more AP/FSD data, excite new owners w/ the possibilities of FSD, and likely hook those who don't want to give it up after a year.