Ay, ay, ay. Okay, let me take a crack at trying to dispel the Whis wankage here, since I have seen a bit of DB. (Not all the way. I've only just gotten to the Tournament of Power.)
First off, the claim that Whis can just travel back in time to make himself not dead. The biggest examples being used for this was Gowasu and how Whis brought him back to life using this method, and then Whis' change in position from when the Earth was annhiliated by Frieza in Resurrection F. Except, Whis, Beerus, Supreme Kai and Goku were watching his murder take place off-planet, and Whis activated his power off-planet as well. Same thing with Frieza destroying the Earth. And due to the nature of the time travel that Dargoo has addressed, in my mind, absolutely correctly, none of the people within the time bubble are going to be affected by this shift in time. And the reason why this is is because everyone in the bubble actually remember the events of what happened.
Now, this is different from when the entire Earth was destroyed by, say, Kid Buu. In that case, the Dragon Balls were used to bring everyone back to life, and there was no time manipulation involved in any way. So, not only did Goku and the others remember that Buu destroyed the Earth, but everyone else on Earth remembered that, too. And yet, for some odd reason, nobody remembered getting utterly destroyed when Frieza blew up the Earth. Why? Because they went back in time to before Frieza blew up the Earth. And hence, no one except for the few people who were grouped together in Whis' time bubble even remember the Earth getting blasted to smithereens. So, in short, Whis would not be able to time manipulate himself, because the very nature of his power causes the space around him, which he is at the center of, to not be effected by any sort of reversing of time.
Now, on to the revival argument. Arke has made the mention that people who die can still grow in power and learn new abilities and can still retain abilities they had in life. Yes, fine, that's very true for the Dragon Ball universe. The Buu saga is a perfect example of this, with Goku having learned to use Super Saiyan 3 during his time in the afterlife and nearly stomped Fat Buu when they fought. However, given my "limited" knowledge on the universe, I cannot remember even one example of someone getting revived from death without some kind of outside force, such as the Dragon Balls. And just like Dargoo said, Whis has never shown to be able to revive himself if he dies. Is he possibly able to revive himself? There's a good possibility that he can, yes. LIterally nothing says he can't. But, due to the fact that, not only has no one been shown to bring themselves back from the dead, but also the fact that no Angel has ever died to prove this, we have to assume that he can't. Nobody is picking on anyone or biasing themselves with one or another universe because of this. It's just that we can't go awarding people with powers that they may or may not have. And the whole feat with Whis pointing his finger at Frieza and him not being dead anymore? That was because Whis was still alive and able to use that kind of power. We don't know if he can still do that when he's dead.
If I missed something, let me know so I can try to help dispel that as well. But, for the most part, I think I answered the important questions, which is that Whis' time reversal would not work, and since we don't know whether or not Whis can revive himself when he's dead, we have to assume he can't. Not for bias, but for simplicity.
