What are the consequences to laying continuous floating floor without using transitioning pieces?
The problem is expansion of the floating floor from seasonal moisture changes**. Transitions provide expansion joints. If you have excessively long continuous flooring, without large expansion joints at the ends, then when it gets humid your floor will expand, not be able to push outwards at the ends, so will push upwards in the middle instead.



** My thanks to DA01 for his comment on this. I'd always assumed it was thermal expansion.