As discussed in the IRC, I think this program does not have a big advantage over mkbootimg/unpackbootimg (which are already packaged). However, Linux distributions are about choice, and so is postmarketOS. If it is useful for you, please package it and create a PR!
My impressions:
Advantages:
On the fly replacement possible, as I understand it, so it's easier to use
No Python dependency (good to keep the base install small, because right now, the fastboot-compatible devices depend on mkbootimg, and therefore Python) - maybe we would make this the default, if it proves to work as well as the official mkbootimg
Properly versioned program (mkbootimg/unpackbootimg don't really have version numbers)
Packaged in Debian
Disadvantages:
Not "the official tool", so it might be incompatible (although I think this is unlikely as of now). If that happens, it will be really frustrating to find the cause when porting, because there are already a bunch of other reasons, why boot.img files could be broken.
Not maintained since 2012 (...but as I understand it, the boot.img format hasn't changed since then either)
Looks like it is not compatible with all sorts of boot.img files. Searching for "abootimg" got me this fork from 2015, which "modified [it] to work with huawei honor 6 boot images".
There were a few cases already where it made sense to suggest abootimg (because it repackages the boot.img without fully extracting it and rebuilding it), so it would be nice to have it packaged actually.