As posted before, I personally prefer the twins over a single with kicker, though I do agree with there being pros & cons to each, but as for the con of taking a hit so hard on both of the twin motors hard enough to disable both props or motors to be a exceedingly rare event. If in known shallows & if possible, as when current is low enough, I proceed on one motor & it sometimes slightly tilted up. But going against the seemingly conventional wisdom here, I believe in normal running, rare enough for me, so as to not qualify on the con, for twins, especially on a boat with the speed capability of a C-Dory. Perhaps others have a long list, but I’ve yet to hear of anyone running twins on a CD 22/25 or even other boat in the CD22/25 normally run speed range taking out both motors by debri or bottom hit. Some may have damaged both props or spun one, but loss of thrust more than the thrust of a kicker only, very doubtful. I’ve spent a lot of time/miles exploring charted & uncharted shallow water at displacement speed & on plane where few boats of the C-Dory type venture with many hits to the props on debris or rocks in the process, ruining a few aluminum props & hitting rocks hard enough to take out a skeg on one motor, when running both at higher speed, but never damaged a motor on either twin or damaged both props at the same time or even spun a single prop, let alone both. Outboard motor manufacturers, especially mercury, test their lower units by purposely having them hit or be hit by obstructions to see what the lower units can withstand without damage to motor or the boat. Big difference when hits are made at very high speed, beyond the capability of the usual speed for a CD 22/25.
Jay