>>282231062
Case example:
>have a quick but hard question about DragondildoAnon's dragondildo particle

Option 1:
>ask in thread, hoping anon sees it
>wait for him to read it
>4 hours later, he sees it (maybe) and answers the question
>you and anons reading along learn something
>others can chime in
>anons reading along had to suffer through your dragondildo fetish they don't care about

Option 2:
>DM or ping him
>he gets an obnoxious sound regardless of what he's doing
>2 seconds later, he sees it and answers the question
>only you learned something new
>nobody else could chime in
>but no anon had to suffer through your dragondildo discussion they don't care about

The most important thing here is the time between question and answer, which in that scenario would be faster for the Discord, and that's why people do it. The immediacy of response is one of the primary driving factors of posting on 4chan, too. But it's reliant on people reading the thread at that moment, or seeing that "(You)" pop up, which for a good reason gives people a high. 
Of course, I was not being charitable to 4chan here, because people might actually respond to DragondildoAnon's post so the (You) occurs - though you can't guarantee that, because people are anonymous and you can't just (You) them - and people might actually have turned their notification sounds on Discord off, but most people everywhere usually just leave the default settings, so it's reasonable to assume those.