"...Don't you mean a high pressure hose, your tank will empty fairly quickly in that scenario compared to a low pressure hose ?...
No, I don't.
As counter-intuitive as that is - a high pressure port is tiny - literally a pinprick in size, so a blown HP hose takes a long time to empty cylinders. On many dives, long enough to surface.
A low pressure port is large - several orders of magnitude larger. A low pressure blowout will drain near-full 12l twins in around 35 seconds.