That is correct, but like I said, we will eventually learn. It will take some time though. I am also at fault because I was here at the start of this hobby and I also didn't get it for many years. Now my fish are immune and I never have to go on disease or quarantine threads and basically ignore them.
I try to tell people how I feel we should get our fish healthy and immune but I gave up on this site because it turns into arguments and I am to old to argue. I get nasty letters telling me how I am a detriment to the hobby for telling people these things.
This is a very large site with many people and they all have opinions. Many people started last Tuesday and they are of course correct. So I gave up on here.
The opinion others offer is no less important than yours. There is more to this hobby than anecdotal experience from one tank. We value the contributions from hobbyists of all experience levels. I hope no one feels they can't/shouldn't offer an opinion based on how long they have had a tank or how long they have been a member here.