In regards to the 68k intergration on x86, while it does share somethings in common with something like RunInUAE or EUAE-Load it also has the ability to make it appears apps are running natively on AROS. Windows will be AROS windows, you have aros menus for 68k software, you can run 68k software on its own screens, and so on and so forth.
I think a lot of the confusion surrounding it, is because to be honest its somewhat cumbersome to set-up properly so people give up half way through with a misleading impression. Yes its different to how os4 and mos'es 68k intergration works, but it gives a broader compatibility and really, how many 68k libs does a person use/want to use on os4/mos apart from those that are needed for specific software (in which case aros is also covered has).
Not saying its better or worse, but as far as "NG" systems go I personally dont think 68k implementation should be a focus, so good enough is good enough.