The original Amiga design had none of those. All of those were added at a point where the game machine market had collapsed and Amiga was running out of money a

The original Amiga design had none of those. All of those were added at a point where the game machine market had collapsed and Amiga was running out of money and/or the final pieces after Commodore had snatched them up. AmigaOS "famously" (to Amiga users) has weird inconsistencies because Commodore last minute had to license a BCPL based system to add the AmigaDOS subsystem which is inconsistent with every other part of the OS, for example, because the original system didn't have filesystems and the like in a working order and the company meant to provide it failed to do so. And so we were grumbling about having to deal with BCPL style "BPTR" pointers (had to be shifted to be dereferenced) for no good reason for years afterward.