In my stable, I have bolt ons, neck throughs, and set necks. All have their good and bad qualities. Oh, BTW, all of my basses are four strings. I've yet to find a fiver or up that I feel comfortable with.
There's a reason Leo Fender's original design stood the test of time - it works. To denigrate it as antiquated is, IMHO, missing the whole point. It is a classic instrument that fills musical needs for a lot of people. I don't care whether it's passive or active - it works, plain and simple. That Leo came up with it and that it lasts today is a testament to his foresight and brilliance IMHO.
Alembics are an entirely different breed, and I submit an acquired taste. Few bass players I've encountered over the years have played much less own one. There's undoubtedly a lot of reasons for this, but for most, the bolt on option is very attractive indeed.
To wit: my '73 Fender Jazz Bass is highly modified. I've got a J-Retro pre in it, a Badass II bridge, new tuners, and Seymour Duncan stacked pickups. It would be difficult (not to mention expensive) for me to do that with an Alembic. But that's OK - they're different instruments that I enjoy for their completely different properties.
For me, I don't care if it was made in the 50s, 60s, or yesterday. If it works, it works, period.
Alan