Yeah of course there's the debate from when they were both coming up as prospects and Harper's 2015 season when it was fair to compare them. What I'm arguing is it's unfair to label Harper's career as a disappointment simply because he didn't become Trout. Harper of course had generational prospect hype and was extremely highly touted, but he's also won 2 MVPs, reached the ASG 7x, 2 silver sluggers (surprisingly much fewer than I was anticipating), and has a career wRC+ of 141. He made it, he was worth the hype. His ceiling was best player in baseball (or at least best player in the NL), heights he reached in 2015 and 2021, but his more realistic career outlook became feared hitter who didn't quite have everything to be consistently in talks for best player in the game.
Any career where a prospect was highly touted and they're on track to be a Hall of Famer is successfully meeting the hype. Unless you're LeBron James whose expectations were inner circle HOF'er and he exceeded those. Baseball prospects are too volatile to have those kinds of expectations, so Harper properly met his.
Harper needs about 15 WAR in 10 years to be considered a relative lock for the Hall, I don't think he really even needs multiple monster 5 WAR seasons in that span to get it done, those will just give him a much stronger argument to be inducted early. As long as he keeps trending in his current path and doesn't decline heavily earlier than anticipated, he'll get in.