User blog comment:Xilinoc/Ch. 663 - GOD OF THUNDER 4/@comment-893798-20160218170357/@comment-3423279-20160219021724

So like how a Shinigami generally only uses Bankai as a last resort to defeat an enemy? I mean.. Yamamoto only ever used Bankai when fighting against who he thought was Yhwach, and Kyōraku only used it to injure an opponent he couldn't otherwise hit.

(Captain Hitsugaya, Ichigo, and Komamura not withstanding)