What's the downside of a self-sharpening chain like Oregon's PowerSharp?

Reviewers are split. Some high-trust r/Chainsaw users say the built-in sharpener is genuinely useful and not a gimmick, letting you touch up the chain in seconds. Others argue the self-sharpening chain geometry cuts worse than a standard chain and locks you into a proprietary system, and note that learning to hand-file a normal chain isn't difficult.