Running skinny in rocky hard bottom rivers are fine. That’s not a problem at all. But not over soft sand, pluff mud or grass. That is a huge powerful suction pump on the bottom.Not sure why the comments around "not running skinning"?
Sir Charles William Feilden Hamilton (a New Zealander btw) invented the Hamilton jet unit in the 50's with the sole objective of running shallow as rivers and streams were the main roads in New Zealand post WWII.
This is very much the norm in NZ. I've seen jets regularly run in inches of water. The need a pool to start in. I wouldn't think they would be very efficient. You can definitely hear them coming for miles. Basically a huge water pump. And yes, the suck up gravel, sand and seagrass and spit it everywhere.
Welcome to the club.