Supercapacitor (which is an electrolytic capacitor) lifetime will be a likely problem. They age.
That was one of the biggest jokes in the trade. They still had to replaced in less than five years and the cost was much higher than 3 battery changes.
Watchmaking has had its fair share of gimmicks. The Omega Coaxial is another notable example (yes, I was trained on it by Omega). It took several market iterations to get it right and I am not sure it is yet without its quirks (I retired about 8 years ago). The design as executed by Daniels works well but was not suited to mass production.
Like the tourbillion, it was once a marque of mastery, now just an expensive toy.
Dirty little secret, with a few notable exceptions, virtually all of the autowind chronos since 1995 use the same movement made by Swatch (7750). This applies to most of the microbrands as well. And the fact is, any watch past a Rolex does not offer a meaningful improvement in timekeeping. It is all about autowind and the alloy balance spring.
Oh, BTW, for our exams, we had to bring stock Eta 2892s to precision time. All 12 got it to under 3 seconds per day rate difference in
8 positions, not the standard 3. As noted above, it is all about the balance spring and autowind.
While used car dealers and drug cartels gave Rolex a bad name (cartels actually used Rolex watches to launder money, buying high in cash (grey market distributors) and selling at slight loss), I spent several months training on Rolex and they are a watchmaker's watch. Meant to be taken down and reassembled with ease, like a Swiss machine tool.
What many do not remember, is that prior to the quartz crisis, Omega were the premier watch and Rolex was the second. But, during that crisis, Rolex stuck to mechanical while Omega went to less expensive mechanicals and quartz which cost it prestige.
All in my family have late 1960 Omega Constellations. I know the person who designed the 751/752 caliber and it holds a place in my heart. But today, either buy a vintage Omega that has not been "improved" or a new Rolex (if you can find one). Far too many vintage Rolex have been "upgraded" for me to recommend those out of hand. My daughter has her eye on my 1967 Speedmaster.
FWIW, I no longer even wear a watch. Ironic.