#2 Undercard stars get to shine at WrestleMania
Complementing the point of having two shorter shows, a two-night WrestleMania is also beneficial from a talent's perspective. A few more spots open up for the Show of Shows, giving various undercard performers the chance to prove their worth on The Grandest Stage of Them All.
It is unlikely we would have seen Cesaro, Sami Zayn, and Apollo Crews all get a singles match at a one-night WrestleMania. One of them might have gotten lucky, but the card would be too bloated. As a result, many matches suffer from the lack of time and investment, especially during the latter stages of a particular 'Mania.
The two-night format allows every match on the card to breathe and tell a proper story. It happened at the Performance Center last year, with a few matches truly benefitting from the layout. That was the case at WrestleMania 37 as well, with pretty much every match serving a purpose.
More WWE Superstars can get their WrestleMania moment this way as well. Quite a few of them got to shine this year, being given the appropriate time to tell their stories effectively. Cesaro was the standout performer of the bunch, with his match against Seth Rollins on Night One arguably stealing the show.