A lot of JS in the wild favors putting everything in objects (maybe not explicitly, but they end up doing it a lot anyway) so gets away with a lot of "const" use that still lets them mutate the values of those objects. If you're dealing with primitives you're going to need "let" a lot more.
That is kind of my point, I don't often work with primitives that need to be redefined. I'd rather operate on an object where I can mutate its value rather than redefine the whole thing.
A lot of JS in the wild favors putting everything in objects (maybe not explicitly, but they end up doing it a lot anyway) so gets away with a lot of "const" use that still lets them mutate the values of those objects. If you're dealing with primitives you're going to need "let" a lot more.