Or maybe they should just copy what Linux installers do- when you install those, they automatically update every package that was in the distribution when it was released. This also includes Flash, for that matter.
Since the Mac pre-installer already knows what hardware is in the machine (it has to select between all of 3 drivers), all you have to do is make Internet connectivity a requirement (because if you can't afford internet access, you probably can't afford a Mac), and wait a bit while it updates. This way, you always have the most up-to-date software
This concept shouldn't just apply to Flash- it applies to every iProgram that is on the machine, including the OS core itself.
And also, your reason is that "You just don't like Flash." We can see that. But please, make the experience easier- as you say, Macs are supposed to "just work" with everything. Don't be partial.