Yes. Rust doesn't even have a good GUI yet, which is telling because it clearly shows that while Rust may be good for some systems stuff, it may not be very good at everything else.
C++ was out in 1985, and qt's first version wasn't until 1995, with kde starting in 1997. And these were simpler times.
I'm very not convinced that lack of GUI is a rust specific problem
UIs generally change a lot, errors aren't so critical, and there are types of abstractions and complexity that just don't exist at the lower layers.
You could so some of the 'core' stuff in rust, but people building UIs would want to use a higher level language.
Imagine writing websites in C. Why would you want to do that, even if you could (aside from novelty).
It's quite beyond the scope of rust.