[RazrFalcon]

>RustyBuzz is quite limited when compared with HarfBuzz.

As the main author of rustybuzz I'm surprised to hear this. If you need a text shaper, rustybuzz is mostly a drop-in replacement for harfbuzz.

Text shaping and TrueType parsing are hard problems, but Rust does not make them more complicated. Quite the opposite. In fact, rustybuzz is written in 100% safe Rust. I would even go further and say that Rust is the only sane option for solving text-related tasks.