I've never had a problem, but just about all the hoses I've done I've backed up with a hose clamp.
I think Aeroquip's non-recommendation about the hose clamps is half marketing and half tech-related. It doesn't do them much good to come out with a fitting that has to be helped out with a clamp. Logic suggests however, that including a clamp is safe, cheap insurance against the very thing that happened here.
FYI, the rotaries do run much higher oil pressures than a pistoni-type engine, but the range is 85-120 psi, which should still be well within the normal operating window of these products.
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