Haack is excellent at putting the ball inside the 20, both directionally and with hang time for fair catches. I think this was a focus of the FO, knowing the offense was going to move the ball, having a punter who could pin the other team deep was more important than having someone who could kick it 70 yds out of the back of the EZ (that being said, at the 2nd open practice haack did have one kick from the back of the EZ to the other 35 - he is certainly also capable of letting one loose as well).
If anything i think he becomes a big positive for the team this year.
https://www.buffalobills.com/news/how-punter-matt-haack-plans-to-use-his-versatility-in-buffalo