In You can’t stand under my umbrella the Raw Signal team makes the case for when it’s not appropriate for managers to be “sh*t umbrellas” for their teams:

When things are steady, and people know the right things to work on, teams are constrained by velocity. We know the course we’re racing, the question is just how fast we can go. In that context, it makes sense for a manager to clear every obstacle out of our way. But during times of significant change, teams are constrained by agility. It’s not that velocity doesn’t matter, it still does. But when everything has changed about the race, we need the ability to steer. A manager who tries to preserve velocity at all costs risks running us into a wall.

They go on to talk about how to Accept, Adapt, and Act in such moments of significant change.