I've spent the last few months porting the guts of a 100 KLOC PHP command-line utility I wrote to Rust. Thanks to the wonderful Rust documentation it's been a mostly painless endeavour.

What I've gained as a result:

- execution speed (about 3x faster, single-threaded)

- better-documented data structures

Things I've lost:

- ease of iteration

- concise, readable code

- really smart type inference

- a bunch of time thinking about the borrow checker

Quick iteration and concise readable code are much more important in web-land than in system programming land, and those are key reasons why I don't think many will be abandoning interpreted langauges for Rust.

I sometimes wonder whether people adopt Rust/Haskell/ReasonML for front-end work because they want it to feel like more of an effort than it otherwise would.

My company has its code basically split in half between Python and Rust. Our Python code uses mypy pretty aggressively. The iteration speed difference is... drastic. Rust far outshines Python in terms of our ability to get something done, maintain it, and iterate on it over time.

That's great for you and your team, but looking at https://github.com/grapl-security/grapl it seems like your needs are pretty different from most web developers.