Without the Wynntils aura timer dodging aura becomes a lot harder. Every warrer in every guild I've been in (and probably most warrers in general) uses this to time their aura dodges. In practice almost everyone who wars has Wynntils installed so this hasn't become a huge issue. But I still think it is not good that a modded feature is almost required to be able to do harder wars. Just today I was doing a practice snipe and one of our guards wasn't able to use Wynntils because they could only use the latest version of mc and not 1.21.4, and they had a pretty hard time with aura compared to everyone else.
I think the best solution to this problem would be to add an aura timer to the vanilla version of Wynncraft. While this is technically making aura easier to dodge for vanilla players, it won't be any easier to dodge than it already is for most warrers. Alternatively you might be tempted to just ban the aura timer mods, but I think that would just make hq war gameplay less fun overall.