I know I am gonna get murdered for this comment but ohh well. lol There was a post earlier about how jump cues have made jumping easy. That is absolutely true. I have taught a crap ton of people how to jump, and its always with a jump cue. However, jumping is actually harder than kicking. (braces for impact) Now hear me out why I say this. Like I stated before, I teach jump lessons. It is more about your fundamentals than it is the cue. If you have good fundamentals, you can jump with any jump cue. If you don't have good fundamentals, it doesn't matter what jump cue you use. My schtick is that I can teach 95% of pool players to dart jump in 10 minutes or less. The reason I say that is there are certain people that I have worked with that just don't have the stroke. However, that person that doesn't have the stroke to jump has the stroke to kick since it is the same stroke as just playing. So from this aspect, meaning the physical aspect of it, jumping is harder that kicking. Everyone can kick, not everyone can jump.
And since I typed this out I will add that I do agree that if the goal is to make the ball, jumping is more accurate. For example. The object ball is 2 diamonds up the long rail and 1 1/2 diamonds out. The cue ball is 4 diamonds up table and in a straight line with the object ball. If you take someone that kicks well to do one or two rail kicks, chances are they won't make that ball no more than 2 out of 10 if they are lucky. You take someone who is a decent to good jumper and they may make the ball between 5 and 7 out of 10.
However I do feel people need to know how to kick since you won't be able to always use the jump cue, whether due to rules or table positioning.