The integration of extremely large-scale multipleinput multiple-output (XL-MIMO) and ultra wideband (UWB) communications is essential to address the escalating demand for high data rates in sixth generation (6 G) wireless networks. However, the expansion of antenna array apertures and/or signal bandwidth introduces the spatial-wideband effect, resulting in frequency-dependent propagation characteristics and the manifestation of the beam squint phenomenon. To mitigate beam squint, true-time delay (TTD) elements have been proposed as promising hardware solutions. Despite this, most existing TTD-based precoding architectures assume idealized conditions, such as unbounded delay ranges and infinite resolution, which are impractical for real-world implementation. In this context, this paper investigates the performance degradation caused by practical TTD constraints. Simulation results demonstrate that under realistic hardware limitations and a finite number of TTD elements, conventional precoding schemes are insufficient to suppress beam squint in XL-MIMO systems as the antenna count scales. These findings underscore the necessity for hardwareaware TTD precoding designs that can effectively accommodate the constraints of practical implementations.