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They give no indication of what kind of drag that adds when placed behind a boat.

That kayaker didn't appear to be struggling to tow it, I would wager in a tandem canoe with 2 paddlers and load you wouldn't even know it's there.

The guys that fish seriously haul stringers of fish which REALLY adds so drag.

Now whether you NEED something like this, is another matter altogether. I don't think you NEED a phone or a fish finder but many think you do which is why I posted this.

Just another option if you think it would be for you.
The last couple of years I see more trip reports with pic/video from GoPro cameras. Charging them plus having a waterproof camp light might be just the ticket to some people.

I have one of those LED forever flashlights in my Go bag that you shake to charge the battery.

Maybe in the future, some smart guy/gal will come up with something that used the motion of the body as you paddle to charge a battery. That would be something.