What is the Hiyyuv to say Kaddish? Kitzur S"A 26:1

[Richard]

Kitzur S"A 26:1, Metzudah Translation
It is customary for a mourner to say Kaddish..

Concerning the the Kaddish there are many divergent rules [Dinnim], in accordance with the various local customs.»

I'm curious
#1
OT1H It seems that it's all a Minhog,
but
OTOH it has dinnim.

Also #2
If there is no definite Hiyyuv, why restrcutrure Kaddish to allow for Multiple reciters?

#3
Why should women feel obligated to say Kaddish?


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Shalom and Best Regards,
RRW

MISTAKES are always forgivable
If you have the courage to admit them.