I'm not as cynical. The "pulling rank" types definitely exist but I've worked with a lot of PMs who overshare either because they're aware the engineering team

I'm not as cynical. The "pulling rank" types definitely exist but I've worked with a lot of PMs who overshare either because they're aware the engineering team doesn't see all their work and want to "prove their value" and/or they're are genuinely excited about their work and keen to share with the engineering team. Those types always react well to gentle reminders to keep it brief.