My LFS will give advice and one personwill say one thing the next says the exact opposite. Like really? One day I bought a light fixture. They said it was perfect for my plants! I called back because of the wattage. They said it was not adaquet. BTW my plnats are growing in amazing.
I have also been told that 2 seperate fish on 2 seperate occasions would eat or not eat my RCS then another person said the opposite.
That's what happens when you ask for opinions. Everyone has one, and they are often different. In a lot of cases, especially the ones often presented in fishkeeping (stocking, equipment, etc) there really isn't a right or wrong answer. Maybe one guy had an experience or heard of someone whose RCS got eaten by their fish, maybe the other guy didn't.
Everyone has different situations and beliefs about certain things. And in more recent years, the idea of tank stocking has become more about giving the fish the most adequate home possible rather than seeing how many fish you can safely cram into a tank.
Each forum or community has it's own idea of what 'works', and a general consensus forms for certain things. Some forums and groups think its totally fine to keep a betta in a minimum of 2 gallon tank, and others would cut you to pieces for even suggesting to put one in something smaller than a heated filtered 5g.
Some people act like its a mortal sin to even suggest putting something like a school of zebra danios in a 10g. It's not something I would do personally, but it's not going to kill or hurt them, and with proper care they will be just fine, albeit cramped.
The moral of the story is that you'll always find a lot of 'wrongs' in this hobby when you look at it in a right or wrong context.