4 pane comic of dolan on the left and spooderman on the right
pane 1 (dolan): cum join opensurce cummunity!
pane 2 (spooderman): shure! how joyn?
pane 3 (dolan): Here discord! (with discord logo)
pane 4 (spooderman with tears in eyes): y u do dis?
There is one possible explanation for that conundrum. There are two types of people who are looking for solutions:
Those who want quick answers. They don't want to do the research - to see if the problem has been addressed before. They don't care about if the question has been asked before.
Those who prefer searching for solutions. They don't like joining any community just to search for those solutions.
Group 2 is going to be very invisible to you (maintainers), because they ask questions only if they can't solve the problem themselves and nobody has asked it before. (I know this because that's me). This group isn't a minority.
Group 1 is the vocal type that you are more likely to interact with, since their first instinct is to ask. If you provide them a choice between forums and chat rooms, they always choose chats because that's where they can get away with providing minimal background information on their questions and doing minimal to no research.
This doesn't mean that the majority of your users are happy with chatrooms. It's just that your observations are going to show this survivorship bias.