I think you were throwing this out in good faith, but just for a chance to stir the pot…
There are a crap ton of 200k+ mile first Gen 3.5 EcoBoosts out there now. Especially considering the oldest ones are 15 years old now. The most problem free examples seem to be the ones subjected to the most severe duty cycles/towing duties.
They seriously overdid it with the first Gen (2011-2016).
Then they took a fairly material reliability step backward while make a big capability step forward with the gen2 (2017-2020). Now the Gen 3 (2021+) is the best of both worlds, forges top to bottom, and a formidable competitor to do battle with the Hurricane. It will be fun to watch these platforms push each other, hopefully with consumer-benefiting results like Raptor vs TRX yielded.
As for the HD duty cycle argument, even to this day Ford puts the Gen1 3.5 EcoBoost into the HD Transit vans (2500 and 3500) -NOT the gen2 or 3, nor any other engine. They are admitting, imo, that the gen1 was the most bulletproof design. So that is an example of a small boosted 6 pot in an HD severe duty application for a serious length of production run time.
All that to say, I think a small turbo engine can be made to hit a variety of targets, including severe duty use. Whether that is or should be the target of the Hurricane or any other half ton engine remains to be seen…