I won't win this argument, and ymmv. :)

But personally, every identifier being a 'const' instead of a 'let' helps me reason about it much better, especially when the code is purely algorithmic. An alternative might be to use something like Facebook's Reason, where such code can be concise and idiomatic.

And full of missing return statements and corner cases. if it only were possible to put an expression anywhere you want :(

there is a tradeoff between ease of comprehension for everybody and syntactic simplicity (that is easy to comprehend for those familiar)