That still does not change the argument that file size does not matter.
In fact, this reinforces it. OSX believes file size matters so
little they’re willing to double file size simply so users don’t have to pick x64 or x86 when downloading the app (and if they’re using the App Store the App Store could do it for them, but even that Apple thinks is too much complexity).
Folks who have the money for Apple stuff have money for large SSDs and fast unmetered Internet.
Aaaand folks who live in the Apple universe have been accustomed to accept that they are holding it wrong, and that there's someone whose job is to figure out what's the official best way to do things. If it involves downloading 130 megs it's 130 megs. No problem. The UX and end result is worth it for them.
In fact, this reinforces it. OSX believes file size matters so little they’re willing to double file size simply so users don’t have to pick x64 or x86 when downloading the app (and if they’re using the App Store the App Store could do it for them, but even that Apple thinks is too much complexity).