There could be other secondary factors. Perhaps it's something to do with e.g. computational photography, where the Google Camera app needs to quickly allocate

There could be other secondary factors. Perhaps it's something to do with e.g. computational photography, where the Google Camera app needs to quickly allocate a ton of memory for all the HDR frames it stacks. Or the fancy call screening. Samsung might not have those kind of constraints. It's probably a safe bet to say that the phone itself is perfectly capable of running the raw model, but not necessarily while remaining usable or without disrupting other features.