It doesn't support Traditional Chinese though, let alone the Taiwanese dialect...

Seems better but it's definitely easy to spot when something has been machine translated, even when using DeepL. Did a test now and if you translate from English into a target language, the corresponding text is definitely not the way a native speaker would formulate it.

It currently supports exactly 4 non-European languages. It won't be a proper Google Translate alternative until it supports at least 3x as many languages.

Their Spanish-English is significantly more idiomatic than google but as others have said - far fewer languages supported. But I suspect deepl will continue to be better than google as they grow.