Taliyah Gameplay on Worked Ground (Q with Low Mana)

When Taliyah has 35 mana, she is unable to cast Q on worked ground.

This is due to it being refunded after the cast however, I wonder if this is working as intended. It creates a lot of "feels bad" moments where you are running through worked ground, unable to cast spells for this reason.

Why is the cost of the ability not halved on worked ground? Instead the refund system allows for no advantageous value outside of laning phase of utilizing worked ground.

Thank you for the response.

Sincerely, a taliyah main.