That's not the point.
Having "some" feats doesn't mean they're all Tier 3, 2 or 1. They needs to have consistency, the writers themselves never write a character busting a planet and thinning "Yeah, that punch was as hard as the Big Bang" especially since by the next issue, an actual big bang level events needs the entire Superhero population to face off against it, and even with all of that, they lose, and need an extra power up or plot twist to work their way out of said problem.
Holding is a thing, they hold back when facing a human, an ordinary rogue, that's for sure. But when actually fighting against a high Tiers villain, they don't. And they not holding back is just "winning the fight with less moves" instead of oblirating each one of those villains, and cracking galaxies.
And those anti feats of them being harmed by Tier 5 chars aren't anti feats, but actual feast to the level they should realistically have