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touch in macOS Sierra is down to 23kB since the 32-bit version is no longer part of the binary.

If you open it up, it's about 2/3rds zeros, maybe 10% Apple signing certificate, a whole bunch of dynamic linking data and according to otool, the (__TEXT,__text) section – normal code – is a mere 3kb in size.

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Thanks for taking your time to analyze the binary. I know we are not constrained by expensive hard drives these days, but this sure is some wasted space.

Why all the 0s? Required padding?

Mach-O files are usually padded to 4096 byte aligned segments. You can inspect the segments with otool, pagestuff, and nm.

NB: UPX compresses it from 23312 -> 12904 bytes (55.35%) using UCL.

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