It may be, that for many, if you hold your order till 2022, you will need to pay the 2022 price.
No assurance from anyone if the Tax Credit will be passed for your specific car, how much it will be, and what date it will go into effect.
Tesla must do what it needs to do to get all their 2021 production delivered in 2021.
Right now, most trade ins have very high valuations. No assurance of what the used car market pricing will be in 2022.
Current Federal and State offerings are not transparent, and lots of behind the scenes wrangling going on.
Many want to stack all the benefits of earlier pricing, latest vehicle improvements, hightest tax credits, great trade in values and getting super high demand vehicle models. Like playing Squid games where you don't know the rules until after you make your choice.