We chase our pursuit of cues looking for a certain "hit" feel, not because it will make us better pool players...
If you find a cue with a hit or feel that you find prefferable it actually can give you the confidence and ease in your equipement to allow you to shoot better pool. Will it make you a better player? Not instantly, but now with that cue that you like the feel of you start practicing with it and trusting what it is doing and you will actually very possibly increase the speed at which you improve with that cue compared to practicing with one where you don't actually like the way it feels or hits.
I get FAR more benefit practicing with my main shooter then practicing with a cue I don't like. With my shooter I can trust where I can go on the cueball for english without a miscue, I know the deflection of the cue and the amount of squirt, I am in tune with the way the cue "feels". If I practice with a cue where the hit is something I don't like or I don't know it's intricasies then I am suddenly trying to modify my own game to adjust for idiosyncrasies that the cue might have in an attempt to make it work.
Case in point I have an old Dufferin with a worn out tip and a loose ferrule which is at my parents place. When I visit there and don't bring my own cue I will sometimes play with that dufferin on the goldcrown they have. Practicing with that cue normally gets me nowhere.
Now if I take my own shooter to their house and practice? I actually gain alot from the practice with my own cue. I trust what the cue does and know it's limitations, and I like how the feel of the hit is. Shooting with that cue smooths my stroke over time, the "feel" of the cue lends a sense of rythm and smoothness to my stroke and I gain alot when I practice with that.
And the crazy thing? 2 hours of practice with my actual shooter makes me a better player with the Dufferin as well. The time shooting with my actual shooter just "feels" good such that my stroke starts to get smoother, I start to stroke the ball like I am supposed to instead of trying to force things, and that makes it such that if I DO then take shots with the Dufferin I am shooting the shots with that added flow and more smooth stroke and confidence.
After 2 hours with my actual shooter I will shoot better with the Dufferin then I would doing 2 hours of practice with the Dufferin itself.
I have never been in the "cue does not matter" camp, I do believe it matters. Great players shoot better with equipment they like, lesser players will get better faster shooting with equipment they like.