Two things:
First, tuners. When I started out, somebody would have a Conn, and we'd each take our turn standing before the Mystic One-Orange-Eyed Oracle and divine a ring or two of the Magic Spinning Checkerboard to get in tune.
Then quartz tuners came along with a +/- needle display, maybe some LED's.
What I really liked was that they would include a pitch generator through a speaker to match pitch. At first, I'd tune up way too high and pop a string or two when I was still wet behind the years. With pitches I could hear and match to, I was WAY better off.
Then when fives came along, a lot of tuners did not tune open low B, you'd have to tune to the octave harmonic. Later they would tune open B, and life was complete. NOT a fan of the clip-ons, though.
Second, the introduction of anti-gravity to bass heads, combos, and cabinets. For a lot of my time, I had bass rigs that kept me cussing and in good shape moving them. It figures once I walked away, bass rigs lost a lot of weight and a common warranty claim would involve the guitar cable pulling the head right off the cab.
In my day, a seaman could have lashed a line around my rig to keep an aircraft carrier snug to the pier.