Being able to use calculators in HS means you can blow past the BS work that can be done on a computer easily into actually interesting mathematics.

Being able to modify the UI and have more tools at your disposal means you can do much more interesting things in and with the battle system.

Everyone has their own ideas about what the UI should look like - this is why customisation is the ultimate win. Configurable UIs -is- the UI revolution. If you've got a great idea for a revolutionary, shiny, spanking-new UI... learn Flash or get a friend to, implement it, distribute it. If it's good, and cleaner than anything else out there, people will use it, heck, it might get implemented into the core game!