FitzTheRuke
Legend
I mean, I dunno. I just think an FTL-capable Empire can evacuate a planet faster than a 0.1c shock wave. They don't even have to go far before they're years ahead of it!
I agree. It's one of the reasons that I didn't like Abram's Star Trek plot-wise (I like it for it's "fun"-factor, but I loathed it's plot-holes) - A Supernova is not dangerous to the Galaxy, the Romulans should have known their star was unstable, the shockwave of the star is slower than any FTL ship, etc, etc.^1
So better writing (which I think Picard has) would assume that there was more to the story than we were told. Sub-space shockwaves, in the very least.
^1 Not to mention the unrelated-to-our-discussion things like how Kirk watched Vulcan blow up in the sky from some ice-planet (must have been Vulcan's moon, right?) or how Nero time-traveled and still blamed Spock for his wife's death - when he could have just gone and rescued her himself.