Taxonomy Query by Count

If you need to sort your taxonomy query by the number of items with that taxonomy assigned, it is quite simple — sort by count.

$query_args = [
  'taxonomy' => $tax ?? 'category',
  'orderby' => $order ?? 'count',
  'order' => $dir ??'DESC'
];

$query_args = [
  'taxonomy' => $tax ?? 'category',
  'orderby' => $order ?? 'count',
  'order' => $dir ??'DESC'
];

Since you don’t want different queries, you can use the query arguments like any other query.