macOS Sierra Preview Extra Services
I am very happy to report that upgrading from Sierra to High Sierra (macOS 10.13.2) reintroduced the text services in PDFKit and therefore Preview.app (Screenshot of a German macOS where "Preview" is "Vorschau" but you'll get the idea):



Classical Apple giveth, Apple taketh away and giveth again cycle I guess...

Maybe this also leads to a more functional PDFKit on iOS.

Cheers everyone

Dennis