I don't really have a side in the jump cue debate, I can use one and can make balls frequently but only on certain shots. Most times, I would rather just kick.
With that said, I agree they take the skill out of hitting the ball but in my opinion, it's still harder to become even remotely proficient at jumping than it is kicking. Jumps can only be executed in certain situations (CB to close obstructing ball, OB is too close to the rail for fear of going off rail, etc. are no go's for me when jumping). And if you're not proficient enough at jumping then, IMHO, you have a better chance of leaving your opponent a shot afterwards.
I guess in short - there are more kick shots that are easier to execute than jump shots. If I'm playing in tourney with jump cues and one guy can't jump for shit then I encourage him to jump, if I'm playing a guy who can jump and he jumps and runs out then good for him because I didn't necessarily lose as much as he won - and that's a mental thing.
I used to not like them because of the same reasons you've said but that was before I bought one and learned how to use it and only then, did I realize it's not quite that simple. I know enough to execute the shots I'm confident with otherwise I will just kick. If I was playing competitively I would probably still practice with mine but now that I play at home I grab it once in a while and hit maybe 75% and make maybe 25%, but I also don't care so take more chance than normal.
It really is an "I don't care" thing and could take them or lose them, they're irrelevant to my game at this point, I just thought I would give my take.