If your boat has plastic rudder cams (and the adjustable rake feature), then you have the upgraded system. The original system had a metal "hook" that engaged the upper casting and did not have rake adjustment feature. I would not say that the upgrade is a "must do", but the newer system has more dependable kick up. The old system can be made to work ok, but it takes more tweaking and requires more maintenance.
Yes, I guess nothing is a "must do" (maybe "should do") but after what I went through with my 1981 H18, multiple broken castings and then a torn out transom, I finally did the expensive upgrade and loved it. Luckily my 1992 system works great.
My opinion is that if you have the metal cam system you should treat it like you have a non-kickup system and never expect it to kickup from impact, even when you are actively yanking on it with all your might while sailing in through the surf.
You really never know when it will kickup and when it won't. The system was probably fine as invented, but it's one of those "if we have known the boats would last so long..." after 20-30 years the system isn't so hot.