Is there some specific reason you would maintain your own base box? My company maintains a series of Debian base boxes (forked from the box cutter project) but

Is there some specific reason you would maintain your own base box? My company maintains a series of Debian base boxes (forked from the box cutter project) but our bread and butter is infra projects, and packer makes it a pretty quick process to rebuild once you identify what to change for a given fix/feature.