It's very, very poor and lazy writing if batshit fascist Vereesa is the only story Alleria gets or is interested in about Sylvanas. I mean, to watch their in-game RP, you'd think Sylvanas and Quel'thalas had gotten up one day and said "y'know, Orcs aren't so bad, let's see if we can join". No context, no detail, nothing of Arthas, and certainly nothing -- if Vereesa even knows -- about the ramping up exploitation of the elves vulnerability by the Alliance afterwards. Probably no charming anecdote about how Vereesa herself had overseen the Kristallnacht of the elves in Dalaran, etc. If Alleria never even wants to hear it straight from Lor'themar, let alone Sylvanas, the dozen year wait has been wasted by Blizz.