Pickups/tone networks have advanced somewhat, but for me, the biggest jump is in amps, speakers, and cabinets.
Pickups, simple, I prefer real EMG low impedance pickups. Silent, toneful, plug-in installation, and I have no Battery Fear. I am NO fan of traditional high-impedance (passive) pickups hooked up to active tone and gain preamp setups. Passive pickups done right are just fine with passive tone networks, no problem.
But as someone who made my bones in the 70's and 80's lugging heads pushing 40 or 50 pounds, and 215 bins or folded 18's that ran 120 to over 150 pounds just for half-assed power sections that ran out of steam at 200-odd watts, the very idea I can have 800 watts in a 5-pound cigar box-sized head in a tote bag over my shoulder, and TWO Subway 215's weigh less than (and handle far more power and sound much better) my old Peavey (135 lbs) or Yamaha scoop 215 (165 pounds) is like a dream. And I don't have to max out everything to try and keep up with some schmuck guitar player with a 50w single 12 guitar amp is just a God-send. Class D power, lightweight but solid cabinets and Neodymium speakers have been as big a jump as steam to diesel, or propellers to jets.
Since I began in the mid-70's (much less the last 25 years back to 2000) things have improved mightily in just about any kind of bass gear you can name, and the number of choices is so very much broader than the choices I had in '77 or '00.
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Ah but I was so much older then . . . . .