The Tk::Text POD documents this behavior:
Name: state
Class: State
Switch: -state
Specifies one of two states for the text: normal or disabl
+ed. If
the text is disabled then characters may not be inserted or
+ deleted
and no insertion cursor will be displayed, even if the inpu
+t focus
is in the widget.
While this may seem inconsistent when compared with the behavior of other widget classes, I've always assumed there was a good reason for it. If you want a Text widget that can't be modified, but that doesn't require toggling -state, you can always use Tk::ROText, which replaces the bindings that are normally used to modify the text with noops.
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