To the "the player makes it..." and "Victor would sound like Victor..." camps, no matter how good you are, if you hit a bunch of deadspots, you'll sound like a bunch of deadspots. Can a more experienced player work around those better? Of course. Can a more experienced player fret better and get fewer buzzes from a low-action neck than a beginner? Of course. Can more experienced hands work with a high, stiff action better than a beginner? Uh, duh. So I have an MIM J that plays fantastic, but if you roll back one of the stock pups, all you get is noise. No matter how good you are, all you're gonna get is noise. But if you use both pups all the time, it sounds fine. Someone wanting the funky one-pup sound isn't going to find that MIM adequate without a bunch of mods. So if V walked into my office and picked up the MIM and dialed it to one pup, he'd sound like...well, not like V, no matter how hard he tried. OTOH, if he picked up my CS and dialed over to one pup, well, he'd like it (I would presume) and I'd have a really neat post to share.
And to the "nuanced boutique" crowd...howzabout some nuanced botique music worth listening to? I have a fairly wide-flung net, yet I've captured very little worth listening to more than once that can attribute its likability to the use of botuque basses. Some older Stanley, maybe, but, face it, it's pretty slim pickins. (I'm always open to suggestions, and follow a lot of links from TB, but I'm just trying to make a general point.) Certainly hard to point to any "hit records." Maybe "Aja", 30 years ago (and I don't really recall or care what was used on that).
But here's where I'm at with it: I have a personal affinity for Fenders because I grew up on them and music created on them. I like the high-end ones because of objective reasons, like the pup noise, their rock-solid stability and consistency (among others), and because of subjective ones--exclusive styling that appeals to me, a more solid feel, and, to me, the ability to cover a wide range of tones for the covers I (primarily) play.
And they DO make me a better player! Not only is it easier--again, for me--to get the sound I want out of them, but, more importantly, they make me want to be better! They inspire me not only with their beauty to my eye and ear, but also with the knowledge that I can do anything I want with them--the rest is up to me. I would struggle with that with a low-end bass, even in the Fender family, as I would struggle to get the tones I like from some 7-string. With the instruments I use (they're pretty-much interechangable), I can be my best, I want to be my best, and they let me and help me be my best. That's worth every dime, and if that have that effect on you, would be worth it to you, too. And, sure, that's a circular argument: I want to be better so I work harder and get better. I'm more the reach-beyond-my-grasp sort, not the do-it-in-spite-of sort, though I appreciate people find motivation in both. But being better because of a better instrument isn't a shortcoming, it's an advantage.
And if you're one of those players who just flat cannot appreciate the difference between an off the rack SX and a high-end instrument, or sound the same whatever you play so your SX is just peachy, power to you if you're happy with that. I think it's kinda too bad. I enjoyed moving up to better instruments (and amps) and opening more doors sonically--you know, growing.