Nah, bowling first is great for your NRR if you bowl the opposition out. If a team is all out, their NRR is calculated as if they had batted 50 overs for that score. NZ currently have a ridiculous NRR of 7.62.
You're wrong actually.
It's horrible if you want to establish a good NRR.
While the against run rate would be 69/50, the for run rate is 72/8.
And its that 8 that is important.
Yeah, they went at 9 an over, but as the tournament goes on 8 overs is pretty meaningless.
Say they play 5 more matches and bat 50 overs, then they would have faced 258 overs. Only 8/258 of those overs would have been, so-called, minnow bashing. I'd much rather have 50/300 of the for run rate come from thrashing Kenya.
For example, if NZ bats first and scores 350 off 50, and then bowls out Kenya for 100 in 30 overs then 350/50-100/50= NRR of 5. It's lower than the 7.62 that NZ has now, but is actually better in the long run.
There's an easy mathematics term that can explain this, but I cba.
Small sample size has something to do with it, but meh.