Does coil whine on PSUs mean my unit is defective?

Reviewers and r/buildapc threads are split: some coil whine is normal under heavy GPU load and not a failure, but loud, persistent whine at idle is widely treated as grounds for RMA. The Corsair RM850e in particular drew coil-whine complaints in earlier revisions, and r/bapcsalescanada commenters note the 2025 refresh appears to have improved it.