Yes, I've watched snooker power shots. I actually just watched a compilation of power snooker shots 2 minutes ago to become familiar.
Power shots come up in snooker but they are less common than in pool. In snooker, the balls are lighter and the cloth is faster so not as much power is required. Additionally, unlike pool, snooker has longer shots, with brutal pockets that require extreme accuracy.
This is why the snooker stance is setup more for accuracy than power. When power shots do come up in snooker, the body over the cue is very restrictive on the stroke and makes it difficult to execute without excess body movement.
In pool, power is a bigger factor and accuracy is less important than snooker. The sideways stance reflects that with additional clearance for the back arm. Pool and snooker are two different games and likewise have different ideal fundamentals.
The opening break in pool is the most obvious example of a shot where a snooker stance would be tough to use to deliver a powerful stroke.