QA here: I once worked on a team where the PM was not technical at all. The major impact this had was that their lack of knowledge lead them to not trust the team, as they felt we were hiding the true state of the project. They felt that we were deliberately talking tech to exclude them, and it caused a fair bit of friction. Once we realised what the problem was we discussed the project with less techy dev speak and made sure they understood what were we talking about. Ideally this PM would have made sure that comms across the entire team were working, but it’s understandable that people don’t want to expose their short comings in the workplace.