In a way, good artifacts are a bit like the proverbial one-eyed person in the land of the blind: While their effect may be not amazing when compared with the best colored cards, that effect is great on the opposite side of the color pie
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Additionally, this effect is highly situational, and not really worth using except in the situation where it allows you to win the game anyway, so I think we have to look at the Discover part almost as an alternate mode that you use when the creatures cant block part is irrelevant, which will be often It looks a lot like Goldvein Pick, a piece of equipment that really overperformed in Kaldheim
Often used on permanents, they can increase or decrease power and toughness, give an ability like flying, represent planeswalker loyalty and lots of other things besides
That means something we really care about will have a greater chance of living