It is all economics.
When you run a massive company that sells goods, you have to make what sells. If you have a new and unique piece, or some other reason that it can sell at top riding, that is what you do. There are lots of ways a Snap-On or a Tiffanys keeps their upper end market.
By the same token, if all kinds of aftermarket companies from Lisle to Harbor Freight make a knock-off of an item for minimal cost, you can't really be bothered with making it, because margin and volume fail to make worth your while. So the seal puller bar made in the 70s by SO that is damn handy that is now made by HF isn't made by SO anymore. If you can do analysis and keep yourself skimming at the top of the market, you're better than chasing all the volume.
Etc. etc. etc. Lots of things drive name branding, and SOs decisions are pretty transparent if you study them.