Ironically, this probably actually led to a better future. Let’s say they destroy one of the stones. Or even two of them. Thanos was singlehandedly thrashing a sizable portion of Avengers. If he knows two stones are gone, it’s likely he goes all-in on a vendetta to destroy the Avengers before he continues culling worlds one at a time.
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Letting Thanos snap was the only reason that he ended up destroying the stones, which made the time heist mandatory, which allowed the Avengers to dust his entire army. Even though the End Game battle seemed to be going the Avengers way, we have no idea how much of Thanos’s army had been expended