My warranty is coming to an end on my 2020 M3 in Jun. Tesla just sent me an offer for 2 years or 40k extended warranty for $2400. I have until it expires to decide. I’ve only had one significant issue - they had to replace the super bottle for the battery coolant system. And 2 x control arms (known issue).
In your case, I wouldn’t worry about an extended warranty until you get close to expiry. You’ll have batter feel for whether it will be worth your $$ or not once you’ve had it for a few year