Automatic Line Spacing issue - 1.5.6.1

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Spilly

Can a Hero please explain the logic behind Auto Linespacing and how one would exploit the feature?

I want to observe the effect of Automatic linespacing at various font sizes, as described in Help "Text Properties". 

I attach a simple Linespacing SLA, best used showing all whitespace characters.

There are no defined styles in the document.
The default font is Arial Regular 11pt
Auto Linespacing is set at 100%

I built a textboxes with default styling.
In f3, I set First line offset to Line Spacing.
I then populated the text, and duplicated it to get six boxes.
Then I selected the entire text and set a test font size value.
 

I was expecting each text box to occupy an increasing vertical space, but that does not seem to be the case.

The 1st 3 lists are all (nearly) the same height - The bottom of the final pilcrow is at 42mm, 42mm & 42.5mm respectively.
Only when the font increases above 14pt does the list height increase significantly, but the line spacing is still closer than I would have expected.

I note the pilcrow symbol is sized at 11 point in every line of all lists.


What is the logic?
When is Auto Line Space useful?  And How do you use it?
Automatic Line spacing is set at 100% - but of what value??

spilly
Using 1.5.6.1 under Windows 10

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spilly
1xWin 10 bog std 2015 laptop   AMD A8-6410, 16GB RAM, SATA SSD
1xWin 11 bog std 2022 desktop   Core i5-12400. 8GB RAM, NVMe SSD

Scribus v1.5.8 64bit on both
in IT for 60 odd years, but little DTP experience