While park factor is a great addition to stats over the past 20 years, park factor doesn't work as well on an individual level with some outlier players whose strengths may play extremely up or down for their home park.
Puckett's BABIP was a whopping .060 higher in the Metrodome. That's insane! And it speaks to someone whose playing style greatly benefited from being drafted by the right team that played in the right stadium for that individual player.
And that mammoth BABIP effect isn't going to be captured entirely from a park adjustment. For example, after scanning a bunch of really good players who spent a lot of time in the 'dome (Brunansky, Hrbek, Gaetti, Mack, Knoblach), Hrbek had the second greatest advantage in the dome, around +.100 OPS. Everybody else was in the "expected home field range", usually +.000 to +.050 OPS.
So even the second place finisher in dome advantage, Hrbek, is still .050 below Puckett. Without modern batted ball numbers to show why Puckett benefited from the dome so much we'll probably never know why this was, but a .148 home/road gap is undeniably large and the dome had a huge impact on how the public perceived Puckett and his career.