[XeTeX] ATSUI/Core Text/etc. Re: "Minimalist" TeX?

[Simon Cozens]

On 23/05/2012 17:31, Peter Dyballa wrote:
> Am 23.05.2012 um 03:36 schrieb Simon Cozens:
>> I'm coming very late to this party but could someone explain why Core Text would be the best replacement here?
> ATSUI is 32-bit only in a 64-bit world

I understand that ATSUI needs to go; that wasn't the question I asked. Why 
replace it with another OSX-only API when others are available?