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I prefer social distancing.
Says who? The pro diesel shops don't think so---very reliable they state once fully bulletproofed. (Now the later 6.4L, yes. Late model 6.7L is the best, in addition to the earlier 7.3L.)
Agreed with you on a Frankenstein, and possible issues arising from that "custom swap." Having had a mildly bulletproofed 6.0L that treated me very well, I'd personally rather have a no-performance-mods, yet bulletproofed 6.0L. That way any good Ford diesel tech can work on it without possible headaches.
YMMV
We are both saying the same thing.
The 6.0 is good once bulletproofed.
6.4 is a throwaway.
I had a 7.3 that I loved.
The first year 6.7 they had some turbo issues, and since then they have gotten much better.