OK--you have changed your mind and there is no such valve on the 60-HP. Then we agree?
The V4 E-TEC in certain models has a valve that alters the direction of the exhaust path, but not the the in-line engines. See the now ten-year-old white paper on the E-TEC at
http://members.iinet.net.au/~pauldawson ... EC_low.pdfOn pages 4 and 5 the V4 E-TEC engine exhaust is shown with the mechanical valve opening and closing to "switch between two exhaust paths" as you suggested.
On page 2 there is a diagram of the exhaust of the E-TEC 60. No valve in the exhaust. There is a water injection solenoid that is actuated by the EMM to cause additional water to be injected into the exhaust to cool it down at high RPM, but there is no mechanical valve that alters the exhaust path so as to "switch between two exhaust paths at a certain RPM," as you claimed.
The exhaust path on all outboard engines is a wet path, as engine cooling water is directed into the exhaust path for cooling. In the E-TEC 60 this is used to advantage by changing the amount of water introduced so as to change the density of the exhaust to enhance the engine performance. If having a wet exhaust path were something that was "a potential trouble spot" as you claimed, I think all water-cooled outboard engines would have that "potential trouble spot."
By the way, I would not be particularly worried about the addition of an electrical solenoid in the cooling water path, at least not any more so than I would be worried about the addition of overhead cam shafts, bearings, and intake and exhaust valves in a four-stroke-cycle engine. Overall the E-TEC has many fewer moving parts than a four-stroke-cycle engine.