You can do that just fine in Rust too, for example the Makepad[1] developers take a pretty extreme non-invented-here stance, and builds a full UI toolkit with no external dependencies (and a major focus on clean-build compile times).

However, it isn't really part of the Rust OSS culture to operate like that. The culture typically values safety over compile times, and prefers to lean on a deep stable of battle-hardened abstractions.

[1]: https://makepad.nl, https://github.com/makepad/makepad