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[Star Wars] End of Palpatine's emergency powers?

Why was General Grievous's death the event that prompted Mace Windu's appointment to ask the Chancellor to give up power? Wouldn't the war still be going on, just with a new Separatist general like perhaps Trench?
gpt
With the deaths of Grievous and Dooku, the Separatists had lost their key military and political leaders, and were essentially losing the war even before that.

With their deaths, the Jedi felt that the war was drawing to a close, and all the "emergency powers" Palpatine had grabbed were no longer necessary - not that they trusted him with them to begin with, but they were in the middle of a war and acting as generals in it so they couldn't just say that he didn't need those powers at that time.