#2 Seth Rollins is not a part-timer

Seth Rollins is a full-time superstar who performs every week. Whereas the current Universal champion Brock Lesnar is a part-timer who is not a regular performer. Lesnar holds the most prestigious belt of the red brand, but he does not defend the title regularly.
WWE ratings were substandard last year, and the ratings drop when the champion does not show up every week. Lesnar won his second Universal title at Crown Jewel, but he defended the title only once after winning the title in Saudi Arabia.
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The Beast Incarnate fought Daniel Bryan at Survivor Series, but it was a champion vs champion match. Lesnar's only title defense was at Royal Rumble, where he faced Finn Balor. As a matter of fact, he is not scheduled to fight at Elimination Chamber, and it is indeed frustrating for the WWE Universe.
Seth Rollins could alter the scenario if he grabs the belt at WrestleMania 35. Since the Architect is a full-time performer, he is guaranteed to defend the title in every pay-per-view. In fact, Rollins might also defend the title on Raw if he requires. Moreover, the fans will be delighted to see the Universal champion every week