Not just the EcoBoosts, since the 5.0 isn't without it's problems now. I have limited experience with the last gen 6.2, but I think it was solid. Here's one recent thread about an '18 5.0, but there are many more:
Need a New Engine
Really, all in all, I think most of the engines are pretty good (although there does seem to be a plague of oil pan leaks, which the dealer's fail to fix properly, which causes another leak). Newer problems are mostly related to things like the IWEs (this actually got my '13, and still isn't fixed on the new ones), sunroofs breaking, rattles, "sinking dash", freezing door locks, brake issues, transmission problems, etc.
Granted, you've got to take into account the sheer number of F-150's sold, but just take one look around that forum and note the percentage of threads related to issues vs. regular threads. It's a night and day difference between here and there.