What happened to the knife tool in CC 2019? It is not with the eraser and scissors tool in the tool bar.
If you're using the Essentials workspace, there is no Knife tool. Switch to Essentials Classic or any other Workspace in the upper right of your Illustrator window and your Knife will reappear, probably hidden under the Scissors (C) or the Eraser tool (Shift + E).
With its new customizable tools feature Illustrator CC 2019 actually allows you to add, subtract or move any tools you want to your toolbar regardless of which workspace you're using. See Illustrator CC 2019 (23) : Customizable toolbars tutorial - YouTube for a tutorial on how to use this feature. You will then be able to customize any workspace by altering your toolbar to fit your needs. When you have what you want choose "New Workspace" from the Workspace menu and rename it as a new Custom version of the original.
Easiest way to find it though is to just change your layout to Essentials Classic. It will then be nested in there under the eraser tool.
I thought i was going mad, your answer helped. Why did adobe decide to remove this from the workspace? What tool does Adobe want us to use to do the same operation in the new workspace?
The tool was not removed, just hidden from the toolbar. If you need to use it, use a different workspace or create your own toolbar.