In the pursuit of robust and efficient electronic structure methods with predictive power, time-dependent density functional theory (TD-DFT) methods lead the way due to their combination of favourable scaling and competitive accuracy. As a TD-DFT calculation first requires a ground-state calculation, any limitations inherent to Kohn-Sham DFT translate directly into the TD-DFT formalism. Due to the additional complexity of modelling excited states, these limitations may not only be inherited but compounded.