Well herein lies the problem with this situation- you buy a cue and play with it for a long time. You get used to its squirt characteristics, the stiffness of the cue, ferrule, tip, how it feels in your hand, etc. If you then introduce a new cue, there is a long adjustment time, and most players can't or don't want to afford the time to adjust to a new cue. So they may feel like their cue is more forgiving than a new cue, but it is possible that it is the opposite...but they will never know because they will not play with the cue long enough. Then couple that with any stroke flaws you might have and adjusting to a new cue may seem impossible because you have become used to how your old cue plays with the stroke flaws you have. When it comes to the quality of a cue, there are only a couple of really important aspects as far as playability. A good cue needs to deliver what you ask it to do, and the cue must be consistent.
So to answer your question, if a player doesn't spend at least one month of hard practice with a new cue, the player may never know if that cue is better or worse for him. Of course, after two weeks if you haven't found much comfort and reliability in the cue, there is a good chance it is not the right cue for you. And, if you have flaws in your stroke, a good cue should expose those flaws because it means that the cue delivers what you ask of it. Then you should fix the stroke instead of the cue!
Deno