If you believe 2-3-2 gives the lower seeded team an advantage, it certainly wasn't a MASSIVE advantage if any at all-the historical data doesn't support that . The higher seeded team had the advantage. If the higher seeded team won at least 1 road game of the middle three after losing 1 of the first 2 home games they were either up 3-2 in the series with 2 chances at home to close the series or down 2-3 in the series with two games at home fight off elimination.
The common saying when 2-3-2 was instituted was the higher seeded team had all the pressure because if they lost 1 of the first 2 games at home they were in danger of losing the series without returning home because of the middle 3 games, while technically that could happen, that line of thinking was incorrect. The lower seeded almost never won all 3 home games in the middle. In fact, the first team to do so was the 2004 Detroit Pistons, after 19 years of the 2-3-2 format, followed by the Miami Heat in 2006 and 2012. And before the 2004 Pistons did that, the higher seeded team won all 3 road games in the middle 3 times with the Detroit in 1990, Chicago in 1991, and LA Lakers in 2001.