A point of frustration for newer languages, that sus continues, is the lack of thought towards simulation and testbench design, and how it integrates with the language.
While it would be nice to have more elegant support for "modern" codegen in the sv/verilog/vhdl, the real unergonomic experiences are test bench design and integration. The only real options are (for sv, verilog, I have less experience with vhdl): use verilator and write your tb in cpp, use verilator and then write your testbench in cocotb, or you work at a chip design company and use one of the big 3's compilers and maybe you use UVM or cocotb. Verilator and cocotb are okay, but you're crossing a language boundar(ies) and referencing generated code -- it is both mechanical and complex to get any design working with it.
If sus had first class interfaces to create testbenches that could map to UVM or verilator, it would be much more interesting. Spade does some interesting things by having its own package manager, but doesn't (afaik) expose a ton within the language itself