I have a Trek 5200 that I bought in 2001 and a new bike would provide zero gains in performance. The new bike would have disc brakes but for a non-tandem road bike they provide no real gain over the side pull brakes on the Trek. Having 18 speeds is not a hinderance in any way. The only gain with a new bike would be wider rims so I could use wider tires than the 23mm on the Trek.

The big gain over the past 50 years has been combination brake shifters which provide a significant improvement over shift levers on the downtube or at the ends of the handlebar drops. Disc brakes have advantages on mountain bikes and tandem road bikes but no on standard road bikes, even for touring. Clincher tires are easier to patch but they weigh a good deal more as do the rims needed than with the sewup tubular tires and their rims.

Electronic shifting is a good marketing ploy and it does eliminate a shift cable run but it also means one more battery to maintain. As someone is already having to charge their smartphone and their earpods and their Wahoo or Garmin unit, a Garmin Varia radar, as well as the battery on my e-road bike, the last thing I want is another device that needs a battery to function.