Actually your example is far from perfect. Given the first, there are a number of automotive suppliers that do supply different auto makers. Secondly, it's just funny. On one hand we have a company building a product to be used on three different platforms. They have then modified said product but so far for only one platform. In your example there is a company building a product to be used on one particular platform...
I suppose you may need to further research the auto industry before you use them as an example. And may also need to keep to the instructions and not be so insulting to everyone.
Actually, I have worked in the auto industry, specifically using the example I gave, third party manufacturers of auto parts are in no way obligated to make those parts for all platforms/makes. Yet again, a prime example of the lack of maturity and knowledge (and understanding that comes with it) displayed in these self-involved posts. Thid party parts providers do, indeed, provide parts across platforms/makes. HOWEVER, they are in no way obligated to let gear-heads, manufacturers, mechanics, or retailers know when or if they're going to release Honda Civic manifold replacements for the 2012 model year, even if they have produced those manifolds for the last 20 model years. They'll simply not be listed in parts catalogs (exactly what we have here) and contacting the company is unlikely to produce any useful information other than to let them know that there is still demand (exactly what we have here).
As far as "accepting business practices", the "whites only" straw man thrown out is ridiculous. The common practices I've outlined are in use because they're conducive to a company's production, schedules, and continued existence. Again, something very few here seem to understand. Bethesda owes you absolutely NOTHING. You paid for Skyrim, you got Skyrim. Just as if you paid for a novel or movie DVD. Nobody involved in either is obligated in any way to provide you any information whatsoever about sequels, director's cut releases, added scenes/chapters releases, etc. Nor are they even obligated to inform you that those releases will only be issued in Serbian and distributed only to Peloponesian island nations. The only interest anyone here could possibly have in Bethesda/Zenimax business practice, and their products/production is if they have INVESTED in them. Buying their products is NOT an investment in a company.