If I was designing it, I would have those and onboard backup batteries in the floor or roof.
Normal usage: the ultracaps
Emergency use: the batteries
Then they can also include other nifty stuff onboard such as infotainment systems, music/communication systems, security cameras, etc. All increasing guest enjoyment while also improving the safety and comfort of the guests.
You're missing a trade off in this. All that stuff has a weight.
Right from the start, the line, number of towers, size of cable, anchors, and all the rest set a maximum weight load for the system. This impacts both how much each gondola can weigh and how close together they can be.
Load up a gondola with all those extra things and you cannot carry as many passengers. Say a nominal 10 passenger car. Then you add 3 passengers weight worth of extra equipment. Now it's a 7 passenger car and you've reduced the throughput/system capacity by 30%.
You could also do the reverse. Change the materials used to comparable but lighter materials and maybe you increase the capacity by 10%. Carbon fiber cabins, cost doesn't matter!
It's all a trade off, looking for some balance. Something like solar reflective coatings to reflect direct heating from the sun are probably nice and light comparably, and somewhere in the middle on cost.
A Rolls Royce car with all the super amenities and comforts one could ever want, but it can only carry 1 person now, doesn't really help anyone. Alternatively, a rope harness that weighs almost nothing is probably too minimalist to be practical, but it would be super light, add all those extra people.
I'm sure they're trying to balance all of this as part of the design. We may not agree with every trade off, but someone has to make those calls.