In that example, arguably it’s pointless (and yes, phasing problems maybe) but isn’t that up to the user to decide what is tasteful?
There is plenty of examples where the feature is very conventionally useful such as using the many single samples in that library and layering them up, or creating new velocity or round robin layers. Maybe I want to mix and match 32 snares from different libraries and make a big velocity pad?
When I initially used the tern “layer” I literally meant layer different instrument sounds on 1 pad. Not necessarily the “layer mode”
Nothing wrong with layering a kick drum with a cymbal though. It’s widely heard in drum and bass for example.
Please consider not removing a good feature that people want to use, and indeed allowing these samples to be dragged out of the browser and layered straight away on the pad instead of doing this trick of dragging to pad, and then dragging pad to next pad.
Cheers!