The only reason for me, would be to stay more on topic and make new threads for the “side talk”.
But that´s only my taste, others often said already exactly that is what they like here. Everything is disscussed right away.
(Edit: Without a question very interessting discussions on it´s own, but nobody can find them burried in other topics without reading just everything.)
For me it´s sometimes not easy, I´m not here 24/7. And sometimes a lot happens in between.
If I see a thread that has a really interessting topic for me, but has already 100+ messages and up to 80% of them have a completely other topic than expected. To find the “interessting” ones, that ones I came for, isn´t easy if you are always on the rush but try to get the essence anyways.
But again, that´s just my taste. And possibly it would be way less active here if it was my way.
Or somebody had to move everything of topic to extra threads all the time… THAT´S a fulltime job 