Ironic, considering that TFA is judgmental about exactly that:
> This approach to coding is far from extinct. One often finds it in software teams, among some highly regarded – though less valued – members. If you've spent several years in the industry or in Computer Science academia, you surely know this subspecies: the developer that replaces a straightforward loop with a series of auto-resolving promises, capped by a cryptic reducer, then revels in their teammates' bewilderment at the sight of the new code. Hardly the personality that you'd select for a coding legend.
And then the site uses JS to implement a feature that every browser has!
:)