HEA is just as much a fireworks show as Wishes was. Both used fireworks set to music to tell a 'story' and both used other effects to round out the presentation. Those other effects have just been greatly modernized in the case of HEA just as they had been with Wishes after FiTS.HEA is not a fireworks show. It is a show with fireworks.
Variety is the spice of life. In the enthusiasm with which projection mapping has been embraced for nighttime shows, WDW forgot that fireworks shows have an atmosphere all of their own.
Incidentally, originality is why I appreciate both of DAK's night shows, despite their shortcomings, perhaps even dullness.