The tilt function can be used to provide sharp rendition of architectural features that would otherwise be impossible to capture, even with stopping down to f/32.
The choice is ultimately a creative one, deciding which areas are safely blurred, to trade off for sharpness on the desired area.
The Schneider 90/4.5 was used with tilt to bring the railing into sharp focus, as best I could manage using Live View. It is very sharp from near to far, something impossible even at f/22 without tilt.
Click to view a larger image, and crops.
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