No, back in the day C was used for everything. Vim was not written in C because it needed to wring every last bit of performance out of text editing.
Rewriting everything in rust "for memory-safety" is a false tradeoff given the millions of lines of C code out there and the fact that rewrites always introduce new bugs.
There's a contingent of rust fans that show up on every story about C – their premise is that C code is unsafe and most safety-critical C code should be rewritten in rust.
Fil-C is new and is a viable competitor to rust, that's why you're hearing all asides about tiny niches, unacceptable performance degradation, etc.
Well the problem with SF is less density and more than half of it is single-family home neighborhoods with zero amenities.
Anti-growth people will point to neighborhoods like Glen Park, NoPa and Noe as "SF" while forgetting most of the surface area of the city is empty neighborhoods like Parkside, Mt Davidson Manor, etc.
It really feels like all these concerns about semantic everything belong to a previous era of the web. I remember arguing with people 20 years ago who believed RDF and the semantic web was going to take over, but the use cases never materialized.