I use every OS under the sun for various aspects of my life. Linux is not a desktop OS.
Please pick stuff that is actually not available on Linux if you do those kind of lists. AMD is providing FLOSS drivers to the Linux kernel and mesa for years now.
For RAW conversion, RAW therapee is available, which is considered superior to many proprietary converters, demosaicers. While it cannot compete with C1 or LR, there's darktable (and I like its RAW conversion more). I have not tried the HDR tools yet, but I think they're promising.
I'm not knowledgable in video editing, and don't work in a color-managed environment, so I'm skipping these.
For office applications, Using Office is your choice. I'm using LibreOffice for a long time on Mac and Linux, even for professional situations. It served me well, and serving well. It's also playing fairly well with latest Office formats, at least with the files I encounter.
There were times when ATI/AMD support was bad, really bad, hardware damaging bad. I personally experienced some of those and reported directly them to ATI. There were times ATI/AMD literally had no video playback support via official drivers, but they're stories of past. AMD is a company which re-designed its silicon to provide better and more complete Linux support. ATI/AMD is not a company which is ignorant of Linux anymore.