I'm not sure why Fender get singled out for lack of innovation.
I don't think there have been any major innovations in bass design that have actually stuck from anyone since the late 70s/80s when active electronics and headless instruments entered mainstream production.
Since then everything seems to be tweaking the same , often Fender inspired, designs.
The only other major change in the landscape of electric guitars and basses I can think of in the last 50 or so years has been the dramatic improvement in the quality of budget instruments over the last decade or two.