Very rarely ? not true
All these companies have Undo/redo button on the interface:
Sketchup , Autodesk, Corel, ACD Systems, Xara, FlexiSign Cinema4D and even Serif's own earlier software
IN fact the only professional software I have ever tried, NOT to have undo/redo (unless it was buried somewhere) is Quarkxpress, Perhaps that's where Adobe and now the Affinity lads got the bright idea from...,
Maybe all those companies were wrong to offer the choice, and should have forced the user down the ctrl zee route.
The fact you can map Undo to the side of a Wacom pen or sometimes a button on one of those fancy mice, shows it would be a trivial thing to add it to the interface.
It shows the Serif staff are listening too much to the vocal fanboys.
They made a similar error, only offering a deep black interface, on Designer beta. which they had to backtrack on.