With a focused product, why would you not focus there? It's no more ableist that Nike making lines of high performance athletic shoes.
I don't really think you can compare a video game to a shoe, sorry. Shoes are tools, games are entertainment. Tools have specific uses that by design aren't made for everyone; art and entertainment is generally made available for the widest audience.
To make a bad comparison, it might be an ordeal to sit the Hostel movies, but at least they are subtitled if I don't speak English. And video players give me the ability to skip past any scenes that I'm too squeamish for.