Interop is only a tiny subset of the entire suite of WPT tests, and it only contains tests that all vendors agreed upon, so no browser will look bad in Interop.

If you look at the full WPT test suite [1], you'll see that Safari is by far the one failing the biggest number of tests, i.e. the most buggy browser.

The Safari team likes to use Interop to trick people into thinking Safari is as good as the others. It's just a PR play.

[1] https://wpt.fyi/results/?label=experimental&label=master&ali...