If you based everything on one series you might be right. But on the season it was our pitching and defense that carried us. It's natural to try to address the team's biggest weakness, and in 2017 that weakness was clearly the offense.
We were 10th in MLB in runs scored, but we were also tied for 23rd in park-adjusted OPS+ with a 92, which is pretty horrible.
It's also worth nothing that in the first 2 games of the ALDS, while overshadowed by the horrible pitching, the offense was also dismal, putting up a pair of deuces.