This is a fish forum. There are posts every day by people asking questions and needing advice. A lot of them are beginners who are doing things wrong, or in a way that could lead to problems down the line. It’s a huge learning curve and because of all the conflicting advice out there, some people do it wrong or badly without realising.
It’s our job to offer advice as we see fit. The fish come first, the owner/poster comes second.
They can ignore our advice if they wish but as responsible caring aquarists we will always offer it, even when it isn’t asked for.
In this case, upgrading the tank if it is “deemed necessary” will not work, because in such a small tank a goldfish (9 out of 10 times) will not grow big enough to need a new tank. It will stay smaller. In fact it won’t grow much bigger than it is now.
Again, the fish come first. As animal keepers we all have a responsibility to look after our fish as well as we can. Not offering advice where we see fit would be a breach of that, so we will continue to do so. Every time.