FAA Parts 91/135 on two way communications and flight tracking are pertinent.
Flight tracking is required of Part 135 operators (for hire). This
is what most Medivac operations in NJ and in the USA do.
Aeromedical in NJ use this system along with radio contact (NJICS) and other aeromedical “bases” to fulfill Part 135 requirements. This offers many operational benefits, including legal Part 135 flights.
https://www.outerlink.com
If an entity is operating under Part 91, there is no comm/tracking requirement. Whether or not this is best practice is an individual question. This can only be answered by the operators.
According to a few news reports the flight was operated by a third party corporation. The final report will spell out the details.
Crash beacons have a less than perfect performance record, and the process can be slow at times.