I wrote a post about why people use #gemini: gemini://nytpu.com/why-gemini.gmi
Also available through the web here: https://gemini.nytpu.com/why-gemini.gmi

Also, thanks to the following people for giving me awesome responses to my rather vague question: @furtivo @solene
@bacardi55
@szczezuja
@twosecslater
@koyu@koyu.space
@benk
CommunistWolf on the Gemini IRC channel