The answer to your original question is yes. Mostly. If you are wanting a certain stereo image and are able to record separate channels, then experimenting with additional room mics can be fun to create a bigger "space" and more air in your recording. If you want a simple solo, in your face performance, 1-2 mics close up are typically sufficient. A nice reverb or delay effect on a mono recording can sound really cool. Double tracking a mono part can also be an interesting way to create a more dynamic "stereo" sound or more punchy mono part. I usually double track rhythm parts while using one mic for leads. More finger style stuff I go for a wider stereo sound. A lot of options that really depend on the song.
https://www.youtube.com/watch?v=F-_xkBoAuJw