I also think that the best Amiga games were better suited for computers, like point and click adventures or strategy games like Civilization. The arcade ports I can think of in particular are mostly of poor quality with some exceptions, so evidently it was hard to on-board people who could develop quality arcade ports for the system. The games that really pushed the system technically and that people tend to remember fondly were almost all released at least half a decade after 1985.
But what I meant - what if there could have been arcade games based on the Amiga, so you would not have to port it to Amiga, but it would have already have been Amiga?
And games console with Amiga hardware but say, 256kbyte RAM and 32kbyte ROM cartridges would still have been an awesome games console. All games for that hardware would have been trivially ported (and possibly updated with more graphics and sounds) for the computer Amiga.