Was overriding cmd+shift+(left|right) with the go to hierarchy commands intentional? On macOS those keybindings are used for selecting text to home/end and are super useful for multi-line editing. I'm removing them in my user keymap as follows for now:

// Override Dendron's hierarchy keymaps
  {
    "key": "meta+shift+left",
    "command": "-dendron.goPrevHierarchy",
  },
  {
    "key": "meta+shift+right",
    "command": "-dendron.goNextHierarchy",
  }