What would you like to see in a web framework?

Hi Peeps!

I'm not a PHP specialist myself but rather I build dev tools (open source). I am knee deep in building a next gen web framework (in Rust) with possible PHP bindings among other languages.

So, with this longish exposition out of the way, my question is - what are the requirements from your end, as developers for a framework ? What would you like to see, and what would you defintely not like to see? Any suggestions or recommendations?