Last time I checked, it was/is missing the entire official AmigaOS GUI (ie. ReAction), as well as some less important components. I suppose those files can be copied over from OS3.9. But in that case, why not just use the proper OS3.9 instead rather than some mishmash of AROS+OS3.9?
reaction isnt particularly necessary, the only software i can recall testing on aros, that needed its classes was aweb. aros contains few appropriate rewrites of those classes and the rest you can obtain from the internet, afair from the class act download page to be precise.
now, aros doesnt provide everything, for instance proper installer tool is missing in c:, but you can just download the commodore version from aminet and put it there. on genuine amiga aros user has enormous advantage against aros x86, that you can use and fill the gaps with genuine amiga software and libraries. for instance you can just use the missing mui classes under zune. i see it definitely as an advantage, not as handicap. aros provides free and open source base to build an amiga compatible system and run amiga software as well as aros software that is not available for amiga (such as aros owb for example). even where its still bugy, slow or incomplete, it comes with the sources and can be fixed and improved.
beyond that aros contains a lot of components that were missing from the genuine amiga os, eventualla up till 3.9 out of the box. there is a handy editor, not a memacs, you can move the windows off the screen without patching the rom with loadmodule. it contains a unified cpu library that automatically loads appropriate parts of it with setpatch after recognizing the cpu at boot time, and therefore the same installation will work on every hardware without messing with 060 or 040 libraries that might left an inexperienced user confused with not bootable or instable system, wondering whats up.
seriously, i dont understand all these complaints.. with the genuine amiga you had to get and install even mui separately, in contrary to where you have zune with basic set of libs. the system was at bare minimum after installation, yet nobody bitches about this. but when aros is missing some libs and classes, it is the reason to put it completely down and refuse to use it?