For the DCT AMG unit, there isn’t one developed specifically for it yet but there is a brake based differential software for it, seems easier to just implement that since it comes at no cost.
For the IPS, probably just time and cost. I’m guessing it’s cheap and easy to add to the MT but expensive and laborious to add to the AT. There are options to add to the AT as an aftermarket.
That all being said, the torsen in the MT has plenty of drawbacks and most people would pick a clutch based LSD if they cared at all.