Ask HN: Do you have refinement sessions too?

My team has one (sometimes two) refinement sessions per sprint (1 sprint = 2 weeks). What we do in these sessions is basically a mini-brainstorming about jira tasks that will go into the next sprint (plus assigning story points). Typically one engineer is on charge of presenting a jira task for refinement (usually a jira task is written by a product manager, but there are gaps and the assigned engineer needs to “fill the gaps” so that the whole team knows what the task is about).

We just got a new manager (ex faang), and he has introduced refinements in our sprints. I can’t but think these refinement sessions are huge waste of time.