OpenSCAD flaw?

[terrypin]

We must have our lines crossed somewhere. Could you try it one more time then, as you’ve lost me!

Earlier you said you’d never used ‘it’. By which, given the context, I assumed you meant the Customizer feature in OpenSCAD. Then in your later post you said "So you reckon it doesn't always work ?".

I then wanted to discover which one you meant. An important distinction IMO, as although they are apparently intended to be equivalents, as you say, one works reliably and the other has a problematic history.

What is it I’ve not read or understood?