It seems pointless to keep urging people not to speculate after a crash for it is the most common (you could call it natural) thing for pilots and engineers to do.
And rightly so. Pilots want to know immediately if there is something dangerous about the helicopters they fly and how to minimize the risk. Anything that can help to make it safer to fly until the actual cause is found is welcome.
The main interest of the manufacturers is to blame the pilot and continue selling their helicopters. Now new AS350 have dual hydraulics despite many crashes over the years due to hyd failures. It did take about 35 years to make the aircraft safer.
Hydraulics may not have been the cause to this crash. But it has been the cause of many AS350 crashes. Many during training and some due to failures.