Can Taliyah get a powershift/revert back to her old identity?
From day one, Taliyah felt like an aggressive burst combo anti-mobility control mage, given how Unraveled Earth functioned, and that it was her main source of damage in a combo that rewarded landing a telegraphed ability with a high amount of damage. She was a fun mage that worked in both toplane and bottomlane, and a strong pick against mobility heavy teamcomps.
Taliyah's current weak state is due to that the changes that have pushed the majority of her power into landing 5 hits in a row on a series of short ranged skillshots that fly in a single direction after casting. And you have to do it repeatedly. Don't get me wrong, it's a powerful ability that does a lot of damage if you can land them all.
However, the problem with it, is the Worked Ground mechanic. Every time you cast it, you create a zone where you get bonus ms, half the mana cost back, and only one of the five rocks you normally throw, so thus only 1/3rd of your damage potential from the ability. If her main source of damage wasn't her Threaded Volley, it'd be just fine.
But it's not fine. The current state of her kit discourages actually trying to fight an enemy during the laning phase, even if you're ahead. It also discourages trying to trade. It's a paradoxial problem. The more you use your main source of damage, the less damage potential you have, and the less damage you do, the more you need to use it.
The current state of her kit encourages non-interaction, and punishes playing aggressively in lane, on a champion who's kit should be encouraging aggressive play. The simplest change to address her playstyle, would be shifting power from Threaded Volley into Unraveled Earth. Removing the maximum number of mines that can be triggered on an enemy, and possibly reducing the damage loss per mine proc somewhat.
Changes such as these would encourage taking more risks, as there'd be a higher reward for skilled Taliyah players. Which is one of the problems with Taliyah's current state. There's little reward for risk taking, as a higher risk playstyle got nerfed.
TLDR: Give Taliyah her telegraphed burst combo and anti-mobility playstyle back, by removing the limit on the number of Unraveled Earth's mines that can be triggered on an enemy, and reducing the % damage loss per mine by 5%, but also decreasing the minimum damage from 55% to 50%. With a small nerf to Threaded Volley's AP scaling to compensate for the increase in burst from Unraveled Earth.