bard speciality clarification

question to pose to yall so um: description of BARD is as follows, "Major focus is on using poetry, song and other artistry to pass on stories, particularly as they pertain to pack traditions." so it says to pass on stories/pack traditions.

description of storyteller; "Major focus is on weaving tales with morals for fun or for education." so education OR fun.

so for storyteller it can be for fun, but for bard it must tell a story? or would ppl be willing to count bard if it is just singing for fun/to entertain? and if bard can ONLY be used to tell stories and not for fun/to entertain, why? thanks in advance<3