Correcto. +1. Ditto

A watt is a valid measure of effort. In this case the amount of effort to propel a bicycle. Be it a 150 pound bike or 15 pound bike, it measures the effort to move the bike and is relative primarily to you the rider although people often measure watts per kilogram of weight. (Don't ask, please)

Another example is a Tour de France rider will use 400+ watts for the duration of a stage. The more watts each rider puts out, the faster they ride and the lower their time. The road, wind, bike weight and distance are about the same for all riders. The difference is how many Watts they generate (with the help of their team).

The pros focus on watts becuz watts are the greatest single measure of cycling ability.