They are a solution looking for a problem, IMO.
I would question if jets are really safer around children. First, no child should get anywhere near a propeller with a turning engine. Secondly, swim platforms add both safety and usability. I would bet there are far more injuries from people slipping off of decks and ladders while trying to get into the water than there are from prop strikes.
Jets are gas hogs. Roughly 20-30% less efficient than propped boats. I will tell you as a fellow river cruiser owner that range and economy do matter as it’s not uncommon for me to go through 100-150 in fuel every weekend we use the boat. That doesn’t sound like much, but add in a stop for burgers, bar tab, drinks on the boat, etc… A long run like from Hudson to Wabasha, and it’s even more.
I have driven a twin engine jet and I can tell you that low speed handling and docking maneuvers are more difficult in a jet until you have substantial experience. The nature of a jet is there is no “rudder” effect to the steering as with a conventional I/O. You only change direction by applying more thrust. A twin engine gives more maneuvering options, but IMO it would take a long time to get used to and you have to be very nimble in terms of applying power, reversing and spinning the wheel to the opposite lock, etc, etc.
How experienced are you handling boats over 20 feet and of substantial weight?
Grouse