I wrote that W and E are both utility spells. Dark matter does damage, Q does damage. Dark matter is harder to land, therefore deals much more damage.
Take Syndra for example. Her Q, W, and E all have delays, and can be dodged by an evasive enemy.
However her ultimate deals more damage than all 3 of them, and is point-click!
So if Syndra were to land her Q, W, and E, but messed up her ultimate (like an enemy stasis), a lot of her damage is mitigated, and the enemy proceeds to win the trade, having evaded her main source of damage.
Should it be complained that Syndra Q, W, and E don't do enough damage on their own? No they are used to set up for her ultimate.
Similarly, Taliyah's W and E are used to set up for her main nuking spell: Q.
The Taliyah in the clip got the knockup-into-minefield part setup, but what's the point of setting up if there's little follow up? It's like a lone Ashe arrow, with no team mates nearby to engage when it hits.