I use a dual cpu 2ghz (not the better dual core version) G5 daily. However, i use Linux on it. It does what i ask of it, and is still rather snappy. Here's a crappy quality video of it in action. Videos played/streamed are in 720p. Youtube 480p.
It all depends on your needs / requirements though. I'm pretty simple, and all i ask is that it browses the modern web, streams audio & video, burns cd/dvd's, edits photos, and handles light office work. So for me, yes, still 100% usable in 2020.
Cheers.
What do you mean? Mine is loaded with an Internet Explorer 9 user agent and works fine...
View attachment 914760
Yep, thats how my G4 PB 1.67 plays youtube with the same user agent, strangely though the G5 Quad under youtube is giving me blank square boxes.