Also, there was only ever one set of macs released in 2006 which had a 32-bit Intel processor, as the transition to 64-bit happened only a year after the Intel

Also, there was only ever one set of macs released in 2006 which had a 32-bit Intel processor, as the transition to 64-bit happened only a year after the Intel transition. We're not merely long past the point where you have no excuse for not supporting 64-bit; we're long past where it made any sense to support 32-bit. Even in 2010 if you started a port to macOS and decided to target 32-bit you would be making a bad decision.