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> even if I can write some GUI in a "rusty" way, it won't suddenly speed up things because GUI is almost never a bottleneck.

Nor are any of the other things people use Rust for, but that doesn't seem to reduce the enthusiasm any.

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Rust does not make your rocket fly faster, but it lowers the chance that it would explode mid-flight.

If that's your reason for using Rust then safety is as useful in a GUI toolkit as anywhere else (indeed I'd say more so - GUI toolkits tend to involve lots of hierarchies and callbacks that make it easy to get confused about ownership, or get into unexpected states).

Rust can also leak memory (memory leaks are memory safe in Rust).

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