I cannot for the life of me understand why these vacs need such huge motor wattages! I firmly believe that it is a marketing thing in that the consumer will go for the highest power assuming it is best. Think about it... 2000watts is equivalent to a 2 bar electric fire. I have even seen some rated at 2200watts and above!
I spent a lot of my younger days involved with the Hoover Company (not today's Italian owned Hoover) but Hoover Ltd of England and most of their machines did not have high wattage motors nor did they need them, for example I have in my workshop 2 original Hoover Constellations (first made 1960's) and both have massive suction using 2 stage motors yet max wattage is 650watts also most of the older uprights have a max of 400-450watts yet will clean a carpet just as efficiently as today's plastic wonders with 2000watt motors!