When S2000 surprises the world with 240hp and only 2 liters NA engine everybody says: Oh yeah! Now the 5 times F1 world champion Mercedes-Benz launch a 415hp 2 liters turbo and some fanboys says "this engine is overstressed" without ANY prove!
I understand that small displacement engines are more stressed then big engines and I will be first to admit that. However, there is a big difference between something like a souped up EVO or Civic Turbo and a factory Mercedes AMG from 2019.
Manufacturing has improved, precision has improved, materials have improved. Don't judge this engine with the same yardstick that you judge aftermarket stuff from 10 - 15 years ago.
Tune at your peril! Agree this is an amazing feat of engineering from a four banger. I think will be overstressed if with any tuning. The mark III Focus RS 2.3lL four cylinder engine max's out at 400bhp with tune. And many have had problems at this level of output.