Should XIV add more end game combat content.

[Jamini]

Yes. They did. Extensively.

Extensively enough to realize that buff-heavy groups would end up dodging buffs given out by the boss, causing wipes because people didn't get the right buffs/debuffs?

Because that was a thing in TOP. It's part of why MCH was slightly favored for a bit. As they didn't add the buffs that DNC and BRD do.