[sp332]

Flash, when used badly, becomes a self-contained sandbox for the entire experience of a website.

But if it's rendered as part of the page instead of in a black-box plugin, doesn't that whole problem go away?

[Yaa101]

No, It's about what is inside the Flash that defines your experience with it.

For me the best trade-off is still to use a flash-block and grant the flash running time when I choose to do so.