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Thanks Peter, he may have been experiencing timing chain wear related performance issues. By now it's worked it's way out. A rattling in cold starts, idle changes have been noted on an Ecoboost forum. I have 2016 platinum with 92k miles, so far so good we don't drive it much now. Still runs...

There is information online that suggests first gen 3.5l Ecoboost engine have more timing chain wear (single) vs 2nd gen 2016 later production to 2019 (dual) with less wear contributing to what you are stating. If it's in warranty that dealer may be stalling to get you out of warranty because...