Alright. So Taliyah is getting a buff on the PBE.
TL;DR: The 
buff is heading in the wrong direction because her Q is strong as it is. E and W are still ignored even when they are very weak and almost irrelevant.
And it is a buff to her Q (Threaded Volley). Yes this is a buff and all, but this is the wrong way to buff her and I'm here to say why I think this way.
First of all, her Q is already very strong. It's sustained damage is ridiculous at all stages of the game and it becomes almost impossible to avoid in the midst of a teamfight. In fact, it's her only decent control skill in teamfights. Yes there is Weaver's Wall, but rarely ever will a player be able to split a teamfight perfectly in their own favour. This makes her become too reliant on just two skills. She's too unreliable. Her damage. Her utility. Her zoning.
Second of all, her E (Unraveled Earth) and W (Seismic Shove) are underwhelming and borderline useless against competent players. Her E just needs one or two Magic Resistance items to completely negate in a teamfight or skirmish. The falloff damage multiplier makes it's damage become much lower than it seems on paper. It becomes even worse when it has no points invested into it. W is slow and plain finicky to use. It does not do relevant damage and it gives no radius indication, making it very hard to target with against mobile champions (And even immobile champions if the opposing player knows the matchup).
So why am I saying all of this? Well that's because Riot is buffing the wrong skill. Instead of putting all of her power budget (Or "Jellybeans" as Riot Zenon likes to call it) into her Q and R, why not buff her E or W? W is still sitting in a corner waiting for it's simple QoL change and E is becoming progressively irrelevant as the season passes. The reason why isn't doing so hot right now is because she possesses two skills that are lackluster. They serve close to no purpose in her kit outside of tacked on DPS and cheap CC that don't even affect the enemy half the time. E's slow is irrelevant against the slightest movement speed buff and W doesn't hit against competent players a majority of the time.
Here are some videos showing how horrible could be even when doing decently well:
