Fast compile times is one of the most important qualities for developer productivity. It made Haskell a non-starter for many developers even before LLM driven development took off.
In US at least much of the high cost is completely self inflicted, driven by Byzantine bureaucratic processes mostly unrelated to the actual engineering requirements necessary for building a safe reactor.
Language design has almost nothing to do with language popularity.
People learn JavaScript or TypeScript because they want to write web apps. Swift or Objective C to write iOS or Mac apps. SQL because there’s a database they need to get data out of. Python because there’s a machine learning library they need to use. Etc etc.
Language design is far down the list of priorities.
I realized paid content creation wasn’t a good business when the only successful paid content creation was courses teaching you how to make money from creating paid content.