I worked for 30+ years in the electronics industry, in both manufacturing and product design.
I have been in meetings where plans were made to assure a 10 year support life for a company’s product by making a “lifetime buy” of a vendor’s parts after a vendor announced they would no longer be making a component in the future.
As I recall, millions of dollars were tied up in inventory of these parts, some of which may never be used.
And some state taxing authorities tax inventories, discouraging companies from keeping a large stock of repair parts.
I do like to repair my own equipment.