Oh yeah, I had forgotten about Rainbow Dash calling dibs on being in everypony's dreams. But I doubt that Twilight would have given her that job. RD is too busy in the daytime running the Wonderbolts and doing farm chores to put in a full night's work afterwards. I like Clarity's answer better.
Is that just how alicorns age? The "many moons later" of the finale seems to be about one generation. If alicorns develop a self-moving mane and tail in that length of time, then Cadance should have had them by the end of s9.
Maybe only virgin alicorns develop weird hair. I know people like that.
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