We've got no problem with threads in general derailing. You're absolutely right - that's what happens in conversations. But the 'Serious' tag is meant to try to keep that particular thread on track. When the tag is used, it's an indication that the OP would like for that thread to stay focused on the topic at hand.
But your point is well taken.
Boru
But your point is well taken.
Boru
‘I can’t be having with this.’ - Esmeralda Weatherwax