He's not. People think the Warriors are a team with a plethora of shooters. It's Steph and Klay. That's it. If one of them them gets hurt for an extended time they aren't going to sit Draymond to find another shooter. CJ and BI are more than enough shooting and scoring to have on the floor with Herb.
Herb is a starter in this league. His defensive impact is just too much. Plus his own scoring ability is underrated.
As for Hawkins, coach Willie loves that guy. He'll get his minutes this year even with a fully healthy roster.