F900 EX
Fully agree with what you write about all the many faults that can slip into a normal operation. Humans tend to forget that human error is a very common desease.
WP
There is nothing wrong with cancelling IFR with that type of aircraft as long as one stays in VMC afterwards. Flying fully IMC into a landing site with zero Navaid or published Instrument Procedure is what makes the case illegal.
One other point that rises additional questions and came to scene in a local TV report this afternoon where the controller on duty was interviewed. Apparently neither a standard radio contact nor a hint they were trying an approach was made.
Jo