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Since you typed that, I did a reading/watching and now understand.
The bird geo chart makes it quite clear. I am going to try and test ride one if I can (also @cake 's). But I am at a point in the deal where I have to make up the mind pretty soon so I might just ask him to draw me something based on Bird/Solaris MAX, 29" and 140mm fork.
amey
Not so important on a full suss as generally the front and rear sag equally so geo numbers will generally be the same for sagged vs unsagged (apart from bb drop).
As @Dammit said a hardtail essentially pivots under sag so HTA and STA get steeper. Reach also gets longer under sag as stack decreases. The longer the fork travel the bigger the changes. For example you’ll get approx 15mm reach increase under sag on a hardtail with 150mm forks