I think it is less of numbers game and more of a guarantee thing. As a user of a new Apple silicon machine you do not have to worry about running x86 software. (Aside from maybe specific audio software and such that are a pain to run on any other hardware and software combination.)

As such it may very well be a loss leader and that is fine. Probably most development has been done and there is little maintenance needed.

Also, while most native macOS apps that I encounter have an Apple silicon version now, I still find docker images for amd64 without an arm64 version present. Rosetta2 also helps with these applications.