The new oil lines have that aluminum heat shielding for radiation to protect the rubber. Should be ok. What could go wrong?

Conduction is a good point. I would think the oil would cool the lines but I'd need to think about it more. The oil cooler can only cool to the engine coolant temp of ~88C (remind me if it's oil to water or oil to air- I forget). I would think the turbos are right after the cooler, or close to it. From what I have seen in the way of racing cooler lines: they are hard with a short section of hose- unclear if that is for installation or vibration. I don't think a full hard line would have vibration problems if each end was secured. This seems like something done on all types of machinery. I think the full hard lines are harder to install on the line and would need to be pretty precise during manufacturing.

I made a hard line for a special brake booster application and it was hard to get it right. I can see why manufacturers use the hosed versions.