It would be useful if a bloc’s background image could be scaled. The top image shows the 1200 x 441 desktop version.
The same way as an image in a bric can be scaled i.e. 1x, 2x or 3x. See middle image.
That way I wouldn’t have to make a special bloc for mobile devices. See bottom image.
(It’s always possible I’m missing something, and it can already be done!)