No she’s not, but neither are all the other average users. The average user does almost everything in a browser these days. I worked for an ISP as an installer for 8 years… I’ve been in ~10, 000 homes. Maybe 1 in 30 people use their computer for serious gaming. Most gamers are console gamers.
But with that said, gaming on Linux has come a long way in the last couple years. Most games that don’t work are the ones with anti-cheat that install what is essentially a rootkit on your computer. Streaming has never been a problem with OBS.