So many things you just said are wrong. The control arms are 100k mile parts, and you can easily replace them with Unplugged Performance versions for under $1k.
(Also my Tesla is 74.5k miles, so nowhere near 100k)
-edit-
I was a victim of misinformation from my local EV repair shop.
https://www.dormanproducts.com/pages/products/oe-fix/article...
The prices you are talking about are incorrect but there are 3rd party parts now.