`abbr -e` shouldn't error on unknown

[IlanCosman]

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❯ set -e blah                                                                   

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❯ abbr -e blah                                                                  
abbr --erase: No abbreviation named blah

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❯  

Why should abbr -e error on an unknown while set -e (and functions -e, though this has better reason) does not? Granted, the use cases are different. abbr is primarily used from the command line while set is primarily used in functions/scripts. But as stated in the the holy texts—the design docs—uniformity of language is to be praised.