Maybe something more neutral just meaning a virtual element / no-element container would better express the intention? And regarding the syntax, maybe it would also feel less repetitive / boilerplaty than <svelte:slot slot="name" />... Maybe something like <svelte:fragment slot="name"> or <svelte:virtual slot="name">?

We could potentially have another flag that was your definition of dirty, but then we run into the hard problem in computer science: naming things.

one problem with 'behavior' is that's the terminology we use to describe all of a component's encapsulated logic — methods, transitions, etc.

Don't be discouraged when you get feedback about a method that isn't all sunshine and roses. Facets has been around long enough now that it needs to maintain a certain degree of quality control, and that means serious discernment about what goes into the library. That includes having in depth discussions the merits of methods, even about the best name for a method --even if the functionality has been accepted the name may not.

Part of the issue is precisely around naming things, and as we often hear, naming things is hard.