Dr. Paul Loiselle was a wonderful, brilliant, quirky human being without whom there probably wouldn't be a cichlid hobby. A true legend and mensch for the organized aquarium hobby. He wrote - my opinion - the best book on cichlid care ("The Cichlid Aquarium") and was omnipresent and available to help with a presentation, judge a fish show, identify fish or just answer questions. The losses of Paul and Wayne Leibel, another legend, are massive. I was at a used book store and ran across some old (early 80s) FAMA magazines...with articles by both.
The fish hobby has always been a mix of science and practical experience. Back in the day, LFS, magazines, books and in-person aquarium club meetings used to be the main sources of info for other hobbyists. Then, when LFS were largely replaced by chains, and the internet, forums like these arose. And over time, YouTube and social media have really taken over.
In reality, we as hobbyists have more access to experts and scientists than ever before. Back in the day, to see pictures of new fish, you'd need to attend - in person - an ACA annual meeting and go to a talk by someone like Ad Konings or Laif DeMason. It's almost all online now, including the next generation of scientist / hobbyist folks like Dr. Michi Tobler, Dr. Sam Borstein, and others.
As a former president, VP, board member and longtime member of fish clubs, it's a struggle to educate and entertain in ways that engage members and bring in new ones. The people with large YouTube followings are the strongest draws for many people - they put butts in seats for meetings and conventions. And get massive numbers of views online. There are some good ones (my faves: KeepingFishSimple, Chris Biggs/The Mad Aquarist, Hans Van Heusden) and lots of clickbait nonsense and theatrics.