ManUpOrShutUp
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I have a 2011 with 60,000 miles and also had a 2014 which I traded in at 33,000 miles. Both had 5.4 / 3 valve engines and I have not had any engine issues with either. I religiously change oil and filter every 3500 - 4000 miles on all my vehicles and have heard that is a significant factor in the reliability of this engine.
I have a friend who had a 2014 5.4 3 Valve who drove it a lot (over 50,000 miles a year) and only changed his oil every 8,000 or so miles and lost an engine at around 150k.
To me, it would be important to know the maintenance history of the vehicle. For that matter, the same should be true of any used vehicle you consider buying.
The 5.4 3 Valve may have faults, but I will say it is a much better performer in a heavy vehicle like the Expedition than the 5.4 2 valve.
So you clocked a mere 93k, which essentially demonstrates nothing about reliability. Your friend blew the engine at 150k, which is a very early demise. Were you arguing for or against the 5.4L Triton?
I haven't been thrilled with the 5.4L Triton, but it hasn't been abysmal either. At 207k, it still has less miles on it than my previous 4 vehicles and I expect the engine to go before it ever hits the miles the others did. However, 200k is certainly acceptable; it just isn't exceptional.