I don’t know if this is widely known, but the solution to the problem of the MIDI note being deleted when you delete its articulation is to use the pencil tool rather than the eraser tool to delete the articulation.
The documentation gives a roundabout way of doing this by suggesting you go to the articulations menu to deselect the articulation:
If you delete an attribute by selecting it and pressing Delete or Backspace, the note is deleted as well. If this is not what you want, deselect the articulation in the Articulations field in the info line instead.