True, but usually there was a Knight or Master present on planet for the trial. The Jedi weren't totally savage about things like that. Now if it had been a Sith trial, oh yeah, they'd totally send them all by themselves.
True. At least the Jedi Apprentice wouldn't go it alone. The Sith would be like, "Your crystal is on Ilum, go get it. If you fail to return, you are unworthy to be Sith and will be quickly forgotten."