Lack of Magical Mitigation: Warriors and Paladins are traditionally considered more focused on physical damage mitigation rather than magical damage. If "Dragonsong's Reprise (Ultimate)" features a significant amount of magical damage or mechanics that require strong magical mitigation, a combination of two physical-focused tanks like warrior and paladin may struggle to handle such mechanics effectively.
Limited Utility: The combination of warrior and paladin might be perceived as lacking in terms of utility and support compared to other tank compositions. Other tank classes, like Dark Knight and Gunbreaker, often bring unique utility skills that can be highly beneficial in challenging content.
Synergy and Cooldowns: Effective tank compositions often rely on the synergy between the tank classes and their cooldowns. If warrior and paladin have overlapping cooldowns or their cooldowns don't complement each other well, it can lead to inefficient use of defensive abilities, making it harder to survive certain mechanics.
https://imgur.com/weaHpHu I will be making a mit doc on this class very shortly.