It's a dumb tutorial, with a locked door, non-openable door, poison and poison antidotes etc. It isn't 15 attempts worth of difficult....
The temple of trials does suck, but because it's monotonous and unskippable, you would have to be barely functional to be dying 15 times in a row...
I still have no idea what the temple of trials actually is. Did the arroyo dirt-eaters build it? What are those plumbing systems we see hints of? Is this some sort of old military complex? Why the archaic architecture then? ??? :S