#3 Unique Pay Per View Sets
Back in the day, WWE had unique sets for every single Pay Per View. Raw and Smackdown had their own sets while every PPV got their own.
These days, Raw and Smackdown have their own set while PPVs use mostly the Raw set with only Wrestlemania and Royal Rumble getting their own stage over the past year.
A victim of a WWE budget cut, WWE stopped crafting unique stages somewhere around their 2016 brand split.
With Raw and Smackdown getting new and improved stages, WWE continued to use them for their PPVs as well.
Even Summerslam and gimmick PPVs like Hell in a Cell, TLC and Money in the Bank didn't get their own set.
Sure Money in the Bank had some ladders spread around and TLC had some Tables, it still doesn't change the fact that the entrance stage was similar to Raw.
Unique PPV sets help make the show feel more special and adds to the aesthetic of any particular show. Bringing them back will certainly be a welcome addition to the current product.