Originally Posted by DatBetta
I think it's still dumb they can still see each other so always flaring and still kept in small container and someone without experience might drown the fish
To be honest, the fact that the bettas can see each other shouldn't matter too much. Many bettas get used to seeing their neighbor and settle down after a little bit of time. Sometimes bettas are too bothered by it. But the majority of bettas I've had have calmed down about their neighbors(be it reflection or an actual betta).
Someone without experience on bettas probably wouldn't put the container down that far anyhow. There maybe a risk that the top(if there is one) could come off and the betta would have access to the whole tank and they need to have access to feed the betta. Can't really feed him if the top is completely submerged(or atleast without difficulty)