In reply to Bud Kraus.

Nope. Because then nobody would find it as easy as of now.

There are lots of different reasons for regenerating thumbnails, e.g. a new slideshow plugin adding different image sizes , or in my case, a daily update / rebuild of the WooCommerce products of the site of one of my clients. In the latter case it turned out its less time- AND resource-consuming to regenerate everything directly after the update, instead of just processing image resizes per individul updated or added product.

cu, w0lf.