echnically speaking (if I'm not misktaken ), it's the C-128 that's the direct predecessor to the Amiga.
Of course you're right technically speaking since apart from the CIAs (which were pretty common in C= hardware) the Amiga inherited nothing from the 64 - fortunately.
But the 128 never glimpsed at gaining the popularity of the C64, the A500 was more into that as
the gaming machine of its time - this I was trying to refer to. In addition, the Amiga became C='s money cow when 64 sales dried up.