To be competitive manufacturers sell products with low margins, intending to profit on downstream spares and replacements at high margins. They have the tooling, intellectual property, volumes etc which make third party manufacture unlikely.
Actual uninsured replacement costs will come be an unpleasant surprise but are generally rare - the last time one of my wing mirrors sacrificed itself in battle was about 25 years ago in the south of France.
Things won't change - buyers of new cars value the benefits of complexity - LED lights, proximity sensors, cameras, etc. They are more likely to be able to cover the infrequent cost of expensive repair, and, bluntly, will be unconcerned about the lot of subsequent owners.
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