#1. To give a layer of uniqueness to the entrances
The ring entrance is an essential component to any WWE Superstar. The Undertaker's legendary slow walk after the gong hit, 'Stone Cold' Steve Austin's shattering glass and quick strut to the ring, and John Cena's salute and full on sprint are all each uniquely iconic.
There are plenty of WWE Superstars with entrances that can be complemented by pyrotechnics. Goldberg is obviously one such Superstar. His entrance punches simply look awkward without the appropriate pyro. Batista's machine gun pose, Kane's turnbuckle flames, and DX's X shaped fireworks are some examples of significantly historic pyro displays that might be making a come back soon.
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Most current Superstars follow the same modus operandi in terms of their entrance - a looping entrance theme followed by a generic walk to the ring. Adding appropriate pyrotechnics will help to make some of these Superstars unique. Imagine Finn Balor, Aleister Black, or even The Fiend with fireworks. With WWE's new commitment to adding pyrotechnics, this could all happen sooner rather than later.