[skeledrew]

It's more the latter, particularly when Rust is used in libraries (eg. FastAPI) as opposed to tools, as it's destroying portability. For example I use flet[0] in some of my projects, and I have to be increasingly careful about the other dependencies as there is no support for the Rust toolchain within Dart/Flutter, and even if there was it still sounds like it'd be a nightmare to maintain. Same applies to any other platforms/apps out there that support running Python for flexibility, and handling another language is just way out of scope (and I'm pretty sure there are quite a few). A key part of Python's existence is as glue between disparate system parts, and rustification is reducing it's usefulness for an increasing number of niche cases where it once excelled.

[0] https://flet.dev