Could not disagree more. Take away one element and see if other still works.
Wishes was a fireworks show that was accompanied by an audio track that matched certain fireworks sequences. Could Wishes work as either a fireworks show without audio and/or audio only without fireworks? We think yes either way.
HEA is a projection show that has fireworks further the projected narrative. Could HEA work as either a projection show without fireworks and/or as a fireworks show without projections? We think not.
Also, as you note, HEA projections are unviewable throughout much of the MK. So be in visual range of the front of the castle or HEA is"unwatchable.: