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?
I just think it's a bad argument. Telling somebody to use web forums instead of Discord is ignorant of why people use Discord in the first place.
Recommending the use of a software for a purpose it wasn't meant or designed for, is the real bad argument. There are a lot of projects that use forums for support questions just fine. Instead when you offer a chat room, people will try to get away with quick answers. But it rarely ends up like that and all the conversation that ensues also becomes buried.
Short lesson - use software for what it's meant for. Don't shoehorn a support forum's job to a chat application simply because people already use it.