Biggest difference I saw when over at the cactus was pro's with one pack mounted in their car and just knocking it on a charger between rounds to top it up. Wow can you say easy.. come on the ability to just top up one pack per car all day long has to appeal. Think of the freedom to run multiple classed to do more work on your car or to go and watch more racing!! This has to be an easy one come on the word easy must appeal to some of you.
As for chassis needing to be changed the only one that I've seen that can't be changed very easily is the AC. the xx4 takes them down one side as will most other cars (pred and xfactory) is this a real issue I don't think so.
These are our fun days out of the house, racing and seeing friends. Lipo just increase the ease of use and let you have more time for the true joys of racing and BSing with your mates.