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By the way - I have a 2017 Model X (purchased in 2017 from Tesla) so that 4 year / 50K mile warranty *no longer applies,* BUT my 8 year / 150K warranty is still very active.
The 8 year warranty only covers the large battery that moves the car, and very little else. In the model 3 subforum, someone is taking tesla to arbitration because on model 3s it does not even cover the PCS that is connected to the HV battery, and people feel it should.
So, yeah, dont expect that 8 year warranty to cover much of anything other than the actual high voltage (hv) battery.