[ibdf]

I think that number is inflated by CMSs such as WP early adoption of jquery. I have used jQuery extensively and I agree that's still relevant, but jQuery Mobile and UI never really took off.

[collinmanderson]

Yes, 28% of all websites use WordPress (over half of the 73%). It means a lot of WordPress theme developers use jQuery.

Yes, jQuery Mobile never really became a thing, but jQuery UI has some pretty useful widgets (autocomplete, date picker, sortable, etc.)