No, we would figure out what we actually want to achieve (objective) and then (perhaps) arrive at that watch hours might be a useful way to measure our movement

No, we would figure out what we actually want to achieve (objective) and then (perhaps) arrive at that watch hours might be a useful way to measure our movement towards our objective. If it is too much likely to be gamed than perhaps it is not a good metric or it needs other metrics alongside. If everything we can think of in terms of measuring if we get to our objective is too easily/too much game-able, then perhaps the objective needs revisiting. Having things gamed to the extreme is also not such a big issue usually because in the end you also watch things like profit. During the ZIRP frenzy that got a bit forgotten in some places, so gaming was perhaps more of an issue. You can also switch objectives and measures if they turn out to be wrong/not useful.