The Android system shell is the MirBSD Korn shell. Why not use the preferred tool? Otherwise, why not write it in dash for strict POSIX conformance? I do adm

The Android system shell is the MirBSD Korn shell. Why not use the preferred tool? Otherwise, why not write it in dash for strict POSIX conformance? I do admit that there are some profound bash applications that are important to me, principally rear.