What about when the OP's question has been answered, and said solution acknowledged by same to have solved the problem? If that thread then begins to evolve in another direction, sparked by something someone had written in it, does it still need to be excised and moved? I think not. But, if threads are split, wouldn't it be a reasonable courtesy on the part of the "woodsman"(or woman) to leave behind a post directing a participant's attention to the new location? (perhaps even a link to same?) If one returns to the original thread looking for the continuance of the tangential discussion and does not find it, then a "search" has to be conducted in order to locate it.