Every company has two loves when it comes to chamberings, theirs and military. Like with the military and love,, reason and wise choices has nothing to do with it.
I believe that publicly traded companies are in business to build share holder equity and in the firearms business the headstamp on the cartridge would be irrelevant as long as rifles chambered for those cartridges would sell. Winchester made 54s and 70s in 250-3000 and 70s in 300 Savage, but there wasn't much consumer demand, so they didn't make many. If there had been consumer demand, you can bet that they would have built more of them.
