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Supported, but not recommended. I switched to JSON-LD last year after using microdata for years.

Agreed. This post should be 100% be titled as supported instead of recommended.

I recall that John Mueller recommended[1] JSON-LD over the other options during a Google Webmasters office hours session.

Many of Google Search's Structured Data features[2] primarily have JSON-LD examples.

I hadn't heard of JSON-LD, but seems sensible, would sure be easier to work with than the traditional microformats.

The name seems unfortunate, though, as I thought that was "line delimited JSON"[1]!