Are 3-in-1 potty seats with attached step stools safe?

Reviewers are split. Verified-purchase reviewers at Walmart and Amazon praise the independence these designs give toddlers, but high-trust threads in r/toddlers flag wobbly steps and at least one reported injury from a ladder-style seat. If you choose this format, parents recommend checking weight ratings, hardware quality, and stability before allowing unsupervised use.