I think you've missed the thrust of the thread. A QTI occurs prior to the LO being formed, while this thread is talking about waiting until the LO is formed by (at least) two players from each team being there, but the throwing team makes the throw in before the opposition team has the same numbers as them.
The laws specify that a QTI can be taken before the LO is formed (minimum of two players from each side) and the argument here is that effectively a LO throw down the line of touch can be taken at any time provided that the ball is still live/zombie (if we want to open that can while we are here). If that's the case, why include a provision that a QTI can occur at any time until the LO is formed - just say a throw in can occur at any time on or behind the LoT, but must be down the LoT if 2 or more opposition players are present - would simplify the whole s**t show of a law set and stop a team taking a quick one when the opposition is in the LoT - I've seen plenty of QTI's taken when the non-throwing team don't put any players into the LO but the opposition chasers were there and waiting.