Signature gear gives us more options, which is good. But there's no guarantee you'll sound like the artist, or that that's what he used during the period you liked him best. Ideally signature gear should be based on tone quality, not popularity and airplay.
"Completely Conceded Glowing Expert."
However, the way it goes that most older artists used whatever pickup that were available to them. For example, Jimmy page used stock tele or paf pickups, Gilmour used stock strat pups in the early days, etc. Lot of guys used JB and DD in the 80s. It was only much later when they started getting endorsements that they wanted to specify what sort of tone they want with particular signature guitar. Some guys actually use the signature pup in their later recordings, and some don't. But I see lots of guys here post about how to cop that early tone of some x artist. Well, it sure isn't the signature pickups.
If the signature gear gets you the tone you're looking for, or some extra feature you find useful, then go for it. Getting the gear of a "hero" who's tone you like makes sense if you want an element of that sound in your tone. It doesn't make sense if (as noted many times) the artist didn't use the signature gear to get their signature tone.
Buying an EVH flanger because it has his name on it doesn't get you anything extra. All that pedal did is make some extra money and make it slightly easier to play a particular cover. Beyond that, signature gear tends to make an immediate association between your playing and someone else, even if you have no idea who the person is. Your playing will likely be compared to that better known person. Those are all valid reasons to avoid signature gear.
this is why i said sig pickups are stupid! Most guys say "oh i use a so and so and pose in a pic but they actually are using other pickups as well. case in point my fav guitarist george lynch was supposed to be using screaming demons well when i talked to him at a clinic he told me he uses a JB,59,emg 81,DD,demon and paf's,old fender singles coils!
Now tell me which he used where?