In my observations, immutability-focused functional languages are generally either non-Turing-complete and built as configuration/declarative languages, or find

In my observations, immutability-focused functional languages are generally either non-Turing-complete and built as configuration/declarative languages, or find niche usage and do not replace JS/C++/Java/C# for mainstream programmers building a spreadsheet or word processor (and aren't built for low-level programmers to replace C++ for a browser engine or video game or non-allocating real-time audio engine).