#2 Respect the Superstar Shake-Up rules
The 2019 Superstar Shake-Up has been widely mocked by fans since the two-night roster changes took place across the April 15-16 episodes of Raw and SmackDown Live.
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Why? Because not only did WWE decide to rename War Raiders “The Viking Experience” (later changed to “The Viking Raiders”), but they continued the Shake-Up beyond the initial two nights and Superstars have been randomly showing up on opposing brands, with no explanation given, for the last three weeks.
WWE's response to Roman Reigns' tweet mentioned how he will not be allowed to feature on Raw due to his status as a SmackDown Live Superstar, so that appears to be the storyline reason behind the company preventing him from showing up on Monday.
There are obviously inconsistencies here – SmackDown Live duo The Club suddenly appeared on Raw last week and became new members of the red brand’s roster – but let's assume that, from WWE's perspective, the Shake-Up was officially finalised last week.