I have speculated in various threads:
I think Adobe needed a rationale to present publically, and that was theirs. There is clearly a very significant number of users that are a) event videographers/editors who must deliver DVD/bluray to clients and b) hobbyists who want the disk format for themselves and to share. My favorite guesses are a) that Rovio's takeover of Sonic/Roxio voluntarily or involuntarily squeezed Adobe financially or b) they don't want to invest the dollars in other aspects of fixing/upgrading Encore.
The Flash to Web options from Encore, and your own illustration, are two very good reasons for keeping and developing Encore in the Adobe suites of applications. But, as I say, I think there are other reasons that may have driven them to this decision. In the meantime, Encore CS6 is it.