While there are a lot of names on pianos there are not a lot of manufacturers. Many fine companies have come and gone through the years and many of their names live on. When selecting a piano ask who builds the piano. Many pianos are built by generic factories overseas in countries such as China. These pianos may have nothing more than a distributor in the United States. They are commonly referred to as stencil pianos because, while the names change, there are really only subtle differences in cabinetry and nothing unique about the instruments. This means there is not a true manufacturer to fall back on for warranty work or parts.
Some manufacturers rely on a third party manufacturer to build pianos for them in order to reach lower price points. These pianos will often be referred to as “designed by...” instruments. Basically you are buying a piano from a manufacturer who bought the piano from another manufacturer. Most industries have cut out the middle men because no one wants to pay a higher price just because the name has been changed on a product. If there is more than one manufacturer the value is lost. A company cannot and will not build a better piano for a competitor than they will build for themselves.
The company of origin is important so you know that the piano was produced in a factory that is owned and controlled by that company. Quality levels are much higher when a company is putting their own name on an instrument and guaranteeing it.