Layer Preset versus Device Chain Preset
A user may want a 'layer preset' to contain complete arrangement settings for the layer including MIDI configuration (channel, note range, velocity curve etc), device chain.. and for instrument layers, pan and levels too.
Conversely a user may want to keep a layer's current arrangement settings and simply load a different 'device chain preset' in to the layer.
At present, layer presets work more like the latter but they reset half the arrangement settings.
You make a very good point. We may need to provide multiple load options for layer presets, similar to what we do now for patches.