I believe both, that a high HP Fist can pull enough vacuum to collapse a thin intake hose, and that this should not happen.
Easy enough to monitor air pressure across intake system, that is what manometers are for.
I am mounting the Mitsu hose this weekend, and just got the parts to convert my driver's side fog lamp to an intake that will feed the lower inlet in my Mountune airbox, which I blocked once I realized (using manometer) the lower intake hose inlet located behind fog light was operating at negative pressure. I do not care how cool the air is, if one inlet is positive and one negative, guess where the air is going to come from.
My theory is 2J intake works very well because it is located in a high pressure zone, thus providing not vacuum but some positive pressure to turbo inlet. Of course, this cannot be tested properly on a dyno. But my aero experiments suggest fog light location is about 25% higher pressure than cowl at 80 mph. We will see. There are things VDyno does better than the machine itself.