Foe's Requiem was removed for the exact reason CKNovel wants a "relationship" back. It created an unhealthy team composition that was heavily favored. Keep in mind that Bard was a staple job in team compositions for a minimum of 6 years in this game's lifespan so this "synergy" was terribly unhealthy. The job you enjoy should be the only job you need for even high-end content. Being excluded because your job isn't magical ranged or provides a piercing debuff for the always there Bard is terrible.

I'm always happy when the developers push toward balancing that enables people to play what they want rather than the meta team for fear of exclusion.