The "perfect" cue is the cue that you can "trust" to do what you intended to do when you planned out the shot.
If you "can do" what "you intended to do", it doesn't matter the cost of the cue, the maker of the cue, or anything else.
IMO, I think a cue "communicates" with the player. The cue's "communication" with one player may be spot on and yet it doesn't "communicate" worth a damn with another player. This is why everybody has different preferences and one guy will think a cue sucks and another guy will proclaim it as the best cue ever made.
I think the "communications" of the cue can be adjusted, to a degree, though different weights, tapers, materials, etc.
I can hit one or two shot with somebody's cue and instantly tell if it suits me or not. I have had people tell my to try their Szambotis, Black Boars, Southwests, etc. and, to me, they may have not "hit" as well as whatever I happened to be using at the time.
I think I can shoot pretty "well" with just about any cue, but the ones that I own "communicate" better with me.
Finding the cue that "communicates" best with you is sometimes hard. Once you find one, I'd suggest holding on to it and keep having good conversations with it at the table.