it's about total cost of ownership. All it takes is a couple of bad door handles (1500$ each) and a broken drive unit (10K$) and now your total cost 16K, just in repairs! if depreciation is roughly 15K over 10 years, then the cost of ownership doubles!
Model S (most expensive) door handles are $750 and the new revisions fixed this issue (2016+ model years). Or if you're adventurous you can DIY it and buy a replacement part/rebuild kit for $175:
https://evtuning.com/products/model-s-door-handle-rebuild-ki...
Drive units are about ~$3-5K based on anecdotes from invoices by actual owners. This was in 2018, they are much cheaper now.
https://teslamotorsclub.com/tmc/threads/charged-for-new-driv...
As, for the drive unit, I thought it used to be 10K maybe it's a bit lower now