In the nicest possible way, this has been explained to you a few times. One of those people who explained it to you was me, days ago.
The answer is that every year is different. Every ball park is different. This is why we have wRC+. The "+" signifies that. We neutralize the data; steroid-era hitters and dead-ball era hitters would be impossible to compare without context and the "+" is the context. Without getting into the weeds of it all it just puts everyone on an even playing field and adjusts for all the things a hitter isn't in control of (run scoring environment, pitching, the ball, etc). It's why Dawson could be the 41st best hitter in 1987 even though he hit a bunch of home runs. And why Pete is a much better hitter in 2026 than Dawson was in 1987 even if the raw data makes it seem close.
And this is exactly why I keep saying you don't really understand WAR. If you did, this would be foundational to you: WAR is designed to do this at it's core. And if you don't know that (and there's no shame in not knowing; learning is a cool thing! But we can't learn until we accept what we don't know, either), which it appears you don't, then of course it's confusing. But that isn't a flaw within WAR, either. And why others are frustrated with the round-and-round here; you're blaming WAR for things WAR isn't at fault for.
Lastly, on the defense, I have no idea what you are talking about, however when you say they were "near neutral" value. Dawson's fielding value was a -7.7. This means he was worth, roughly -8 runs for his defense. Part of this is his positional adjustment; RF isn't valuable. But Pete Crow-Armstrong has been worth 23.7 FV, or roughly,. 24 runs over the course of a season. We generally accept that 10 runs = 1 win. Napkin math tells you right there where almost 3+ wins of his fWAR comes from. That's a massive difference in value.
Sadly we don't have the defensive tools to go back and exactly explain how good/bad Dawson was. We have far more data-driven models because of all the cool tech we have. But based on the numbers we have, Dawson wasn't grading out as a plus right fielder. Based on Total Zone rating, which is about as advanced as we can get for the era, Dawson was the 12th best RF'er in baseball. Pete Crow-Armstrong is above and beyond the best center fielder this year. To the point he's closer to being 2x the second best at his position than he is the 3rd best defender at his position.