I take your point, but as an Arthur/RISC-OS user for many years now using Ubuntu linux on a recycled x86 PC I get - audio/video encoding, editing and playback

I take your point, but as an Arthur/RISC-OS user for many years now using Ubuntu linux on a recycled x86 PC I get - audio/video encoding, editing and playback and format conversion. - a lot more pixels (1920x1080x24bit vs 640x512x8bit - a 19 times ratio, plus accelerated desktop). - I could browse the web on the A3000 (12 MHz/2Mb) but it was slooooow, just keeping up with the 14k4 modems. And, yes, I do mostly the same things, LibreOffice and LaTeX instead of !Impress and !Sigma. Vi or Gedit instead of !Zap. I can see me using a low power Arm based desktop when the SoCs become powerful enough to run GIMP and Audacity.