It's not because it's "more easy to write". It's because code that generates the entire tree every time can be side-effect free, while stateful UI is, well, sta

It's not because it's "more easy to write". It's because code that generates the entire tree every time can be side-effect free, while stateful UI is, well, stateful. We can debate if that's good or not, but it's not about "ease of use". Neither is it necessarily more wasteful. It's a different paradigm.