I disagree. Blizzard clearly keeps on rolling out these characters because they know that at least some people will recognize them, this is likely their main reason, because they already tried to shift the focus on their new characters in BfA and most people didn't really care about characters like Talanji, Taelia, Calia, the troll kid etc. Admittedly, they threw in Baine as well, which is imho down to simply not having much on the horde side to choose from, since they killed off the only notable troll, pretty much dethroned kottiwix at least ingame, killed saurfang and seem averse to use Lorthemar for anything of note. Most of the AR leaders are at best side characters anyway.
I mean at the end of the day Anduin is just there because Sylvanas is extremely petty, in fact all 4 of them are, the jailer sub-plot only came into being after he saw him use holy magic in the maw. So none of them actually make much sense being there, in that regard Baine actually makes the most sense, since he actively defied Sylvanas in BfA. Thrall openly rebelled against her with Saurffang as well and Anduin is the enemy leader. Jaina is probably the odd one out, since they never interacted at all in BfA iirc.