I’ve only just heard of steam canners but I’m similarly intrigued..
Also the owner of a rusty water bath canner.
My friends’ grandmother has used a steam canner for decades and swears by it; seems like A good system and a lot less water to boil.
There’s also older generations in my family that instead of water bath, get the brine and jars real hot then pack them and set upside down to seal. Learned that in the 4H club I guess.
I know that works for pickles, but tomatoes are still processed in water bath.