I’m one of the few suppliers. And there is something giant against the powered anode: it’s expensive. Water heater manufacturers use sacrificial anodes for good reason. They’re cheap, they don’t break, and they don’t require electricity.
The makers’ margins are razor thin, and they shun anything that would put them at a price disadvantage to their competitors. But they are the most economical solution to odor issues and they work well in softened water where sacrificial anodes can be consumed quickly.
The powered anode DOES solve problems that are caused by bacteria reacting with sulfur in the water, but there is a question without an answer about stagnation. I don’t know how long it has to sit idle for there to be odor. The case that made me realize it could be an issue was six months.
It will probably solve the problem, but I can’t know for certain. But it’s a good idea just because you have a water softener unless you’re willing to check the factory anode every year.