Choices add cost. Not just testing and support, but in this case, the cost to reputation too. The population breaks down to those that:
- understand the choice
- think they understand the choice but actually don't
- don't understand the choice (and some even don't want to)
So let's say they add a checkbox (actually, a switch) somewhere to enable Flash. And then, as predicted, Flash sucks. At best, you can say, "Wow, Flash is really crashy and kills my battery. At least it was my choice to make and I will accept the consequences." But much more likely it will be turned into, "Wow,
the iPad is really crashy with lousy battery life," or, "Netbooks are better with Flash than the iPad!" In the aggregate, a few people are a little happier, but most are less happy, including Apple.
And that's before getting into the strategic reasons for excluding Flash.