Find your tribe in a Sea of Creativity
Hey guys, let's think about bendalloy ferrings, aka Subsumers, for a minute.
We know they can store nutrition and calories in a metalmind which means they can eat as much as they want when there is lots of food and then tap it later.
Think about a Subsumer at a Scadrial eating competition. "Sure, I can scarf away as many hot-dogs as you want. No problem."
Think about a Subsumer at an all-you-can-eat buffet. They get to try everything and then go back for as much more as they want of everything they like. Such restaurants would have to have special rules for subsumers...maybe a pay by the hour thing?
Imagine if Lift gets a hemalurgic spike that lets her become a bendalloy ferring. She would have the best stormlight storage system. She could eat loads, store most of it in her metalmind(s), and then tap into it whenever she needs stormlight. Unlike spheres, it wouldn't leak away and if she is tapping it from the metalmind she isn't sucking the energy out of her body.
On the darker side of things, you probably also get the occasional Subsumer who is desperately afraid of gaining weight and always stores everything they eat in their metal minds and never taps them. Most people don't know that they are a ferring and everyone sees them eating, so people don't realize there is a problem until it has gotten really bad.