Are push walkers safe for babies learning to walk?

Across the parenting subreddits we read, including r/NewParents and r/beyondthebump, the consensus is that push-behind walkers are considered safe and developmentally appropriate, in contrast to the sit-in style walkers that pediatric groups have warned against. Reviewers consistently recommend supervising use on hard floors and looking for a model with speed resistance so it doesn't roll away from a new walker.