I'm developing a new ruleset of mahjong. It's supposed to be a hybrid of Japanese rule and Chinese rule. I'm also considering including the joker tile, also known as baida (百塔). Here is the sketch of how it works:
There are 8 joker tiles in total.
Upon calling Mahjong (和了):
if you have 2 joker tiles, they are considered as an arbitrary Pair (対子).
if you have 3 joker tiles, they are considered as an arbitrary Chow/Pong (順子) / (刻子).
if you declared a concealed Kong with joker tiles, they are considered as an arbitrary Kong (槓子).
It is possible to declare Pon, Kan, or Ron to a joker tile.
It is not possible to declare Chi to a joker tile.
A Dora tile declares itself as a Dora. This also applies to a joker tile. But if the tile is a flower tile, it doesn't declare a Dora.
But I'm unsure how this will change the game strategy. How will the game strategy change, and why didn't Japanese rule and Chinese rule use joker tiles at the first place?