Bash-like scripting in shells is prevalent in operating systems but I don’t understand why, when it doesn’t have the syntax to make programming easy like other languages. What features does bash have that make it so suitable for shells? Why even new operating systems like Redox OS choose a very similar syntax over a completely different programming language?
Because other languages available at that time lacked certain programming conveniences found in bash :) Despite its shortcomings, it’s still a very convenient language for running other programs, working with files, and piping output from one program to another, or to a file. Bash was first released in 1989, and I don’t know exactly when it passed the threshold for widespread adoption, but I can’t think of anything that would’ve been a better alternative.
I think OP is also asking “why aren’t people switching to something else now” which is a completely different question.