I think if you look at recent additions to basses like the S1 switching from about 4 years ago, they tended to be things that worked well on Jazz basses but were a bit redundant on a P-bass.
I've already nailed my colours to the mast many times on my views of P-basses (pro, for any first time readers) but I can't help but wonder if the P was perfected in the 50s. Granted other basses have come along since but the P does what it does. Not for everyone granted but great for those who like what they do. P basses are super enough for me as they are