The lack of LSD could be to try and reduce the need for traction control.
When you put the power on it will spin up and allow the power to be dissipated to a degree. Given the low RPM turbo torque of that engine it would be a bit of a shocker if the LSD locked up and laid the power down in one BIG FAT lump coming out of a roundabout. Snap oversteer would be a lot more dangerous ?
Or they could just be saving it for a GTN model?
I asked Steve Morris why no LSD. His answer, which I didn't fully understand, is made clear by your comment. Too much torque at low RPM and big throttle openings would be terrifying.
So really, it needs traction control, as all such cars with such engines seem to have!
I think the 200 bhp 4 cylinder manual could be an utter delight and a lot more predictable.