It was reported on Wrestling Observer Radio that WWE has been going without pyrotechnic displays for all wrestler entrances, making the choice not as a matter of uniform aesthetics, but as a cost-cutting measure.
Some fans are none too pleased, and a few of them reached out to Brian James (aka Road Dogg), one of the top producers for SmackDown, to lodge their complaints.
Let's just say he wasn't too receptive.
Whether pyro is necessary or not, at the top of the page, you can see the added spectacle that made the wrestlers of the past seem more special.