i would not buy the annual service as its overpriced.
in terms of the extended warranty, i would wait closer to when your 4 years is up.
it really depends. Tesla has revised many of the common bad parts. if that is the case. I dont think its worth paying the 4000-5000 for extended warranty.
some of those items such as
door handles($200 per handle i think)
mcu screen bubbling($1000 to replace)
drive unit(you already have 8yr warranty on this)
even if these things break, its less than the cost of extended warranty so its hard to justify the value