So? The Cubs in the midst of this streak came back from 6-0 and 4-2 (both times with multiple runs in the ninth). When you don't pile on, your chances of winning goes down. Sure you want to "save" runs but that's just not how baseball or any team sport has ever worked.
The key to remember is that this wasn't a pile on where they scored 10 runs in the eighth of a 3-2 game, they scored seven runs in the first two innings and continued to bury their opponent and never gave them any glimmer of hope.
As a team, they were 4-9 with RISP. They had more XBH (9) than strikeouts (7). The starter went 5+ of one run ball. They scored multiple runs in four different innings. I simply don't know what you want from a team.
