I think (but don't know) everything new was done to make it even more attractive to Fender orientated bass payers. The downsizing, the std size pus, the body without pu rings. In my opinion, you'll get the best Fender tone when playing a Fender. It's so simple 🙂 The new line does not amaze me that much. Played an incredible BBP35 at Guitar Summit two years ago, no 4 string could match that sadly.
I started with a 300 back in the 80s. Went up from 1600 to 3000 then came the Hifi years with active basses. When the BB series started new with the 414 I fell in love again with the series. My main bass is 1000MA for nearly 25 years now (this bass even smashed my 3000MA) and last year I found some 424s in mint condition that are just wonderfull. I remember putting a pu ring on a beautiful 300 in candy apple red, I should have kept that (heavy) bass 🙂