What about browsers?
- Firefox removed its core support since version 64.0 (December 11th, 2018)
- Chrome removed its RSS add-on few weeks after Google reader shutdown
- Opera removed Opera mail (containing also RSS reader) with Opera 15, back in February 2013
- Safari removed its built in RSS reader back in June 10th, 2013
- Samsung Internet is a Chromium fork. But Chromium has less features than Google Chrome
- Yabrowser (Yandex browser) is a Chromium based one
The only major browser to support RSS is Internet Explorer.
Well, we have a trouble. A severe trouble. The standard might be dead or dying ...