I vaguely recall that the individual trust company route requires 75% US ownership, which is normally a bunch of lawyers.
The individual trust company route is used almost universally on upmarket stuff (jets etc) and it protects you from the uncertainty which occurs if/when the trust company owner dies.
When Warren Chmura died, there was a lot of nail-biting. None of the 200-300 N-reg planes owned by SAC could be flown, AIUI, and I certainly did not fly mine.
There may also a general concern about who might end up controlling the company in such a case; some characters in aviation are totally unsavoury. Fortunately SAC came out fine.