The best discussion platform is IMHO the older version of reddit / i.reddit with the nested comments + possibility to be indexed by google + possibility to reply to old posts. The super-nesting comments feature is great.
This is actually hugely beneficial to discussion as it makes people focus on the most salient point first, and further points go below, and each are easy to address individually.
Longer form material goes to outside links, sometimes, but Twitter threads are also great for long form content. At least for executive summaries that link out to the detailed bits for each primary point. Once the UI for Twitter prioritized threading, it became quite easy to express extremely long chains of evidence.
The tweet threads are not terrible, but are inconvenient enough for people to be succinct as possible. Now there are walls of text from blue check marks that like the sound of their own voice far more than their content is insightful.
Sure I've read interesting long tweets, but I'd rather have a link to another site meant for long form writing than it living on Twitter, doubly so now as what bits of good content there were are behind a login wall.
But i get it, Elon needed something to make the blue check "worth it".