6/7 less so because people who bat there are worse and have to face the second new ball. At 5 you're in the sweet spot of batting from 30ish overs through to whenever and if you do get to the second new ball you're probably already on 80+.
Shivnarine Chanderpaul worked this out early in his career and spent the next 15 years fluffing his career numbers while his team rotted around him.