Exactly! The Tushui are the most useless ally in the Alliance. They have done literally nothing since their introduction back in Mists of Pandaria. They didn't send any Monk to the Battle for Lordaeron, and Aysa is a wild card because she loves a Horde leader.
And even the Lightforged: they have the Vindicaar, which would have been quite useful for aerial support during the battle (or just to teleport the troops around with those Lightforged beacons), yet they didn't even bother to move it. I didn't see any Lightforged in the Battle for Lordaeron. At least the Ren'dorei bothered to show up and gave whatever support they could to the cause.
Lastly, let's not forget about the High Elves of the Silver Covenant. They might not be playable, but they are still an organization within the Alliance. They didn't help Anduin at all in the Battle for Lordaeron. Unlike the Ren'dorei, who at least did something useful in the Battle.