NXT TakeOver typically has good / “special” entrances for lots of their wrestlers, while most non-WrestleMania PPVs usually just have “normal” entrances. The reason for this, according to the Wrestling Observer Newsletter, is that Triple H is personally in charge of NXT entrances, while WWE entrances are handled by Kevin Dunn, but ultimately by Vince McMahon.
WWE also has PPVs a lot more frequently, so it’s probably not sustainable to have a new “big” entrance every month. Couldn’t hurt to do “special” entrances at the big four PPVs at least, though…