Bleach is the epic development of themes of sacrifice, loyalty, and unbreakable bonds, defining the world of Soul Society, and Jushiro Ukitake's story is one of the most heart-wrenching examples. A mild and tender Captain of the Thirteenth Division, he dedicates himself to safeguarding his comrades, suffering from a crippling disease.
The final act does raise some questions, though: was Jushiro's sacrifice in Bleach pointless? It plays a role in one of the darkest moments in Soul Society, namely through his connection to Mimihagi as the Right Arm of the Soul King.
Disclaimer: This article reflects the writer's opinion and includes spoilers from Bleach.
Exploring whether Jushiro's sacrifice in Bleach was pointless

Jushiro Ukitake's sacrifice in Bleach seems pointless. The entire character is so underexploited that the circumstances around his tragic death feel all the more pathetic. Ukitake is one of the oldest and most respected captains in the Gotei 13.
He could have easily had the level of spiritual power, experience, and wisdom to potentially make a big difference in the battle against Yhwach and the Quincy army. Instead, he was taken out of the show at a crucial point in such a way that people will question whether his storyline was worth it and if he was really sacrificed for nothing in the grand story of Bleach.
Throughout the series, Ukitake is portrayed as a kind, compassionate leader who has good principles and great loyalty to Soul Society and his comrades. However, his illness prevents him from actively participating in the big battles, making him a unique captain compared to other very powerful captains like Yamamoto, Byakuya, and Kenpachi. But despite this limitation, the short combat scenes for Ukitake reveal the true potential.

For instance, he has a very rare kind of Zanpokuto, Sogyo no Kotowari, which is capable of absorbing and channeling attacks. That would have been a strong advantage in the war between the Shinigami and Quincies.
Still, he was hardly given much of an opportunity to exercise his full potential. Until the Thousand-Year Blood War arc, his end even seems predetermined because the nature of his illness dominates his character.
His last act is to offer his life to the Mimihagi, Right Arm of the Soul King to save Soul Society in what proves to be its final stand. By this time Yhwach has absorbed the Soul King and puts in motion the implosion of this fragile balance between life and death. The final loyalty act of Ukitake serves only to momentarily stay the inevitable but accomplishes little that will last long.

This self-sacrifice allows Mimihagi to take the Soul King's place temporarily, but Yhwach quickly overpowers this effort, making Ukitake's death ultimately pointless. This small window of reprieve doesn't change anything for Soul Society nor even try to guarantee anything worthwhile, so this death is useless.
The aggravation of Ukitake's sacrifice is how much of his character remains unexplored. Kubo brings in the mysterious connection he has with the Soul King and Mimihagi but leaves it all without developing or bringing any kind of resolution to these concepts. Adding this to the fact that Ukitake had latent potential as a captain, there is definitely more that this character could have done and played out in the war.
Rather than his being there in pivotal moments, to see where his character arc peaks off, fans are left with a half-developed character whose death seems a sheer convenience of the narrative rather than one of heroism.
Final thoughts

Jushiro Ukitake's sacrifice in Bleach is tragically pointless since it almost has no real influence on the plot or his character development. His potential as a wise, powerful captain is wasted as his sacrifice only delays things for a little while, having little real impact on the outcome of the war or Soul Society's safety.
His underdeveloped relationship with Mimihagi and the Soul King leaves his storyline unfinished, making his death a momentary thing rather than a lasting legacy.
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