Why are so many people complaining that Shin doesn't have children yet, when this is actually really common with generals in Kingdom?
If you look at the generals and great generals you will soon realize that many of them don't have any children or even a confirmed partner. Here's a list of generals and great generals where we know for certain that they don't have any children:
- Shin
- Mouten
- Ouki
- Tou
- Riboku
- Yotanwa
- Kanki
- Heki
- Duke Hyou
- Earl Shi
Then there are ones where we don't know for sure, but I believe that they don't have any children either:
- Renpa
- Karin
- Gohoumei
- Shibashou
- Shunsuiju
- and many others
As you can see, Shin is hardly unique in focusing on battle and other things instead of founding a family with Kyoukai. If anything, those who do that seem to be the exception here.