This is one of the things that tilts me about C and C++ that has nothing to do with mem safety: The compile/build UX is high friction. It's a mess for embedded (No GPOS) too in comparison to rust + probe-rs.

That hasn't been my experience at all. Cross-compiling anything on Rust was an unimaginable pain (3 years or so ago). While GCCs approach of having different binaries with different targets does have its issues, cross compiling just works.