S
Sunseeker
Guest
For many, it isn't.
Tools that help the in-game improv of DMing are a great help. Morale rules are one of them.
I disagree, the issue is too sensitive, either the outcome is a laundry-list of monster-specific, highly situational morale tables or it's a flimsy "well if one of their allies drop they might feel bad and run away."
Morale guidelines are something that should be discussed in the DMG, but they're not something that can really exist effectively in any specific manner. They should be developed and deployed at the table at the DM's discretion, if the DM needs them, they'll come up with something.
Honestly morale doesn't need to be anything more than "intelligent creatures might run away when their allies are dead and their health is low." That's IMO, the best way morale rules can be established.