Algol: You seem to be suggesting that it is not possible to transit the outer bands of a typhoon using normal wx radar techniques then you go on to describe you doing exactly that on your flight to Taipei! Plenty of people have told you that overflying the eye of a typhoon can in fact be smooth but you seem to disbelieve them. Is your real gripe with CX crews that they haven't filed turb. reports like you think they should? Are you also claiming that the only aircraft to fly the route were CX ones at that time. Has it never occured to you that turbulence level reports are subjective. By the way, it is not arrogant to state how things are normally conducted in airline operations. Does your flight planning department "order you to fly specific routes" with no deviation. I suspect not.
As to my bono fides I have listed my HK licence number to give you a small hint at my own exposure to these conditions.